I have a MacBook Pro and I can't see anyone not being able to do 90% of the things that they can on either the Windows or Linux side. The only issue is with games. And I did not buy it to make some sort of "politco/social statement", I bought it for a number of reasons but the most impt being OS X. Frankly, if Apple decided to slap OS X into Thinkpads, I'm there!
As for compatibility, I work with Word a LOT and virtually all of my docs are shared. No problemo. If you're using OpenOffice on the Linux side then you will probably have issues. There was a thread about a couple of months back where everyone said stick with MS Office and not OO. Wait, the lone exception was someone who probably never used OO and just drank the Linux kool-aid.
As for compatibility, I work with Word a LOT and virtually all of my docs are shared. No problemo. If you're using OpenOffice on the Linux side then you will probably have issues. There was a thread about a couple of months back where everyone said stick with MS Office and not OO. Wait, the lone exception was someone who probably never used OO and just drank the Linux kool-aid.