Mac... About a month to adjust, all kinds of programs/software and whatever else, never a problem, software, hardware, or otherwise. Three years later and still runs like a stud. Added a 500 GB harddrive and upgraded the RAM, cheaped out when I bought it, and everything is cool. My wife has a Macbook as well and is on 4 years with no problems. Went to a 500 GB harddrive in hers as well, otherwise haven't touched it.
The expandability isn't as great as with a PC, but it just works. Flame on...