Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
I would never recommend it as your primary OS. Whilst things are stable now, you really can't predict what will happen in the future.
 
More stable and snappier than any of Lion's DP's ever were and even Lion retail to some extent.
I have experienced a FPS rate with launchpad, mission control and dock animations that I never got with Lion; booting time is noticeably faster and overall, the system really feels very stable and snappy. Apps open very quickly, Finder is lightning fast (on lion it takes about one second after i click the icon to get a window), Safari also seems much snappier than the current Lion build.

I really think ML will be a very very good release!

P.S.: I'm running a clean instal on a new partition in my main HDD. I wouldn't use it as a primary OS right now because there's a lot of incomplete text and the ocasional bug here and there.
 
Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3)

Is Aperture 3 working for anyone on Mountain Lion? What about Dropbox?
 
Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3)

Is Aperture 3 working for anyone on Mountain Lion? What about Dropbox?

Dropbox is working but icons on the files don't show up. Files are syncing though.
 
Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3)

Is Aperture 3 working for anyone on Mountain Lion? What about Dropbox?

I tested Aperture 3 and it was working fine on my installation. :)
 
I wouldn't recommend as main OS stable, but unpredictable.
Very different overall result the installation on iMac and mid 2009 MBP; much better and more stable on iMac than on laptop where Messages, Mail and Cloud crash without even opening.
Safari is fast but buggy, occasionally doesn't load images or doesn't load pages properly.
As said previously, finder search and spotlight are malfunctioning and are not 100% reliable.
waiting for DP2!
 
I went and erased my Lion partition and reinstalled Snow Leopard and then did the install to Mountain Lion from a clean SL install (probably didn't do anything, but I wanted to wipe my OS X partition anyways).

Anyways, ML has been pretty damn stable for me so far. Has it had some quirks, yes, but hey, its still beta.

Even in this early state, its much better then Lion. Can't wait until its done.
 
Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3)

Is Aperture 3 working for anyone on Mountain Lion? What about Dropbox?
Aperture 3.1 is working, but 3.2.2 (latest) crashes.
 
Wipe Lion and go full ML?

Hey, Everybody!

I'm (finally) buying my new iMac this Saturday, since my Mom's tax return deposits tomorrow! (I'm paying for half the iMac, though)

Anyways, I want some advice. When I heard about ML, I took $99, and bought a membership to the Mac Developer Program. I downloaded ML tonight. Now, I'm buying the $1499 config of the 21.5" iMac. Specs below.

21.5-inch: 2.7GHz
2.7GHz Quad-Core Intel Core i5
1TB hard drive
AMD Radeon HD 6770M with 512MB

Now, I had 8GB of RAM delivered from Crucial today, so I'll actually have 12GB RAM instead of 4GB RAM. I am considering wiping the HDD, and fully going Mountain Lion. I have Lion on a USB drive in case I want to revert. Is Mountain Lion stable enough for day-to-day work, and to jump over?
 
It's a beta OS, so I would advise against it unless you know what you're doing. If you really want to, I would clone your HD with all your apps to an external, and then install ML onto that. Use it for several days and see if your apps are compatible before you decide to take the plunge.
 
No. I wouldn't recommend it. It's still in the developer preview stage, therefore it's very unstable and still has many bugs. Some apps don't work right in it either.

Hell, some people here would recommend waiting until the final release at least gets a bug fix or 2.
 
Hey, Everybody!

I'm (finally) buying my new iMac this Saturday, since my Mom's tax return deposits tomorrow! (I'm paying for half the iMac, though)

Anyways, I want some advice. When I heard about ML, I took $99, and bought a membership to the Mac Developer Program. I downloaded ML tonight. Now, I'm buying the $1499 config of the 21.5" iMac. Specs below.

21.5-inch: 2.7GHz
2.7GHz Quad-Core Intel Core i5
1TB hard drive
AMD Radeon HD 6770M with 512MB

Now, I had 8GB of RAM delivered from Crucial today, so I'll actually have 12GB RAM instead of 4GB RAM. I am considering wiping the HDD, and fully going Mountain Lion. I have Lion on a USB drive in case I want to revert. Is Mountain Lion stable enough for day-to-day work, and to jump over?

For a first developer preview it's very stable but there are a still a few kinks that need to be worked out. I'm running it as my primary OS right now without trouble, but others have reported differently.
 
Wipe Lion and go full ML?

No.
That is literally asking for trouble.
ML is beta for a reason.
It's not thoroughly tested.
Do you want to be a fulltime beta tester?
Why? There's not a lot of nerd points in it.
 
I agree. Developer preview releases are intended to be for developers who need an idea of what the OS is going to do so that they can update and test their software with a version that is near feature complete (but not necessarily stable). It is not intended to be used on a day to day basis. It’s for testing and development so that you can get your apps done as soon as the OS ships.
 
Hey, Everybody!

I'm (finally) buying my new iMac this Saturday, since my Mom's tax return deposits tomorrow! (I'm paying for half the iMac, though)

Anyways, I want some advice. When I heard about ML, I took $99, and bought a membership to the Mac Developer Program. I downloaded ML tonight. Now, I'm buying the $1499 config of the 21.5" iMac. Specs below.

21.5-inch: 2.7GHz
2.7GHz Quad-Core Intel Core i5
1TB hard drive
AMD Radeon HD 6770M with 512MB

Now, I had 8GB of RAM delivered from Crucial today, so I'll actually have 12GB RAM instead of 4GB RAM. I am considering wiping the HDD, and fully going Mountain Lion. I have Lion on a USB drive in case I want to revert. Is Mountain Lion stable enough for day-to-day work, and to jump over?

Pretty poor idea. ML is not the least bit stable. Use Lion.

Buying a Mac Dev membership to run buggy software for a few minutes is the worst use of $99 I can possibly think of.
 
ML is getting worse as days go on. Brand new bugs each day.

Recommending it to anyone as their only OS is a very, very poor suggestion.

Despite what some people are saying, there are significant bugs...some people just haven't found them yet.

Its also working different of different machines.

ie: 5 year old iMac running fine with few bugs.

2011 MacBookPro quad core 8 GB of RAM 128 GB SSD, many bugs, slow graphics, stuttering Full Screen app transitions, some apps crashing, WiFi turning itself OFF during sleep (never seen this once before).

Today, Messages does not work at all.

There ARE issues. Don't even consider using it as primary OS
 
Wait until ML is released. Never make a beta preview your primary OS. That's just silly. At the very least, install it in a second partition (or external drive) if you want to toy around with it.
 
At the very least, install it in a second partition (or external drive) if you want to toy around with it.

I completely agree however I have two iMac's to fall back on if anything goes wrong so I made it the Primary OS on my MBP and I've been using it fine every day since the 16th..well I didn't start using it until the 17th as I went to bed while it installed lol.

I did a clean install by making a bootable 10.8 USB stick.

Best bet though is to open Disk Utility and make a little partition of maybe 20GB just to install mountain lion onto and play around with it, see how buggy it is for a few days and if you think you can tolerate it then do a full wipe and use it as your main OS however I am not encouraging you to do so, Safari is very glitchy and no longer likes to tap click for me while using flash applications like youtube, I need to physically click for it to work but it works fine on Chrome and Firefox.
 
I feel that this is just the missing update that I was expecting to see in Lion, with iOS 5 having all these new features and Lion coming out around the same time I just feel that this should simply be an update for Lion rather then an entire OS.

I'm using it as a day to day OS and I don't have any problems except tap to click doesn't work with flash on safari, other then that everything works perfect. tap to click works on firefox and chrome though.
 
Minor graphical bugs here and there, otherwise performance seems better than Lion. No slowdowns or crashes at all. Pleasntly surprised :)

iTunes sometimes doesn't respond. And I do get the graphical bugs that come with Full Screen.
Also having a hard time with messages, I can send or receive files. And can't chat with iPad, iPhone, iPod users.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.