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Honestly, I've been the person before who likes to jump the gun and use the newest software out. But reality, it's not stable even though it feels stable. It's too unpredictable if something goes wrong. Therefore, I'm doing all my testing under a virtual machine and upgrading to Mountain Lion when it comes out officially. At that time, I should've learned all the tricks and cheats on how to use the OS efficiently and stuff.
 
Running it for a couple of weeks now. Safari and Mail are a bit buggy, for the rest it works fine.
 
i downloaded it today and will use it as my main OS. Safari so far seems much slower. No other issues as of yet.
 
Been using as my primary OS on my MacBook Air since Feb. and just updated to DP2 last night. Feels very stable and solid but can attest to it being unpredictable.
 
I am, special reason, coz i'm using hackintosh with GTX460 display card. Only mountain lion gives full support for my display card so I stayed with MLion.
Another reason is that I REALLY love the ios apps and notifications centre being moved to mountain lion. works real great with all my iOS devices.
 
I'm using it as my main OS, my only issues are that some web pages lag as you scroll them, and Reeder doesn't work in it.
 
I have a 27inch iMac at work that is used mainly for Apple Remote Desktop and software testing... so it is my main OS on that machine but definitely not on my main Mac
 
I am now using DP2 as main OS and it works pretty well. Only graphical glitches that I have experienced frequently. The first few boots after installing DP2 had some issues I had to hold power button down and reboot because it would get stuck on the Apple logo. But I think it works great. Safari is much quicker. Everything feels smoother especially animations like full screen.
 
Just rolled back to OS X Lion after having some huge stability issues with Microsoft Silverlight and a few applications refusing to install (downright silly with all of these installers refusing to install on anything other than 10.7.x when they normally will work without any problem with 10.8.x anyway).

The fact that XBMC is instant crashing is also a main reason for me rolling back at this state. Didn't have any major issues with Mountain Lion itself, but all the applications that wont install and some instant crashing and behaving funny made me roll back.
 
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