AT HOME
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I use a 24" iMac as my primary workstation and mothership with 2x MBA's and 2x Dell netbooks for portability depending on my needs. One of the Dell's is running OSX and does it very well!
I upgraded the internal disk in my iMac to an SSD and use a FW800 attached Drobo for data storage.
I use a 1GB Time Capsule for wireless connectivity and have another Drobo attached via USB to it for Time Machine backups. All data is backup up one additional time to a central file server where it is then also replicated off-site. My printers are also on the network and allow wireless printing from anyplace in the house.
All my Photo's, Video & MP3's are stored and shared through the file server and I keep local MP3 libraries on each of the laptops for traveling.
TRAVELING
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I like to travel light so usually only travel with a laptop, charger, usb broadband card for wireless. If I have need for more space, I'll bring a portable USB Hard Drive or two.
I don't use a laptop case or sleeve, everything just gets tossed into my leather messenger bag (work) or backpack (personal). Quick and easy to pull out when needed or when going through security at the airports.
The OSX netbook spends most of its time in the glovebox of my car, perfect for quickly checking email or the web while on the road or stuck waiting for someone/something. The Windows netbook I use for the times I need a dedicated windows machine or am dealing with a Windows centric customer in place of a VM on the Air.
I do 100% of my traveling with the Air but have used the OSX netbook in it's place a couple times and it is equally as capable, especially for general email, office, itunes type tasks. If Apple came out with a 10" netbook with a decent resolution screen, I'd purchase it in a heartbeat!
I use .Mac to keep everything in sync.
MY OPINION
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Despite a lot of peoples negative comments and experiences with the Rev A MBA, I find it to be a very capable machine and am very happy with it. I don't see it as having any short comings or limitations. I think the $999 refurb is an amazing deal and would pick up the air over the new MacBook (based on my needs and preferences) any day! Given the choice to purchase a Rev B or Refurb A at current prices, I would also still go for the Refurb A!