i bought a rev a, this time last year... it was a 1.83 core duo with 512 ram (stock) and an 80 gb...
since purchasing it went in for:
-the original logic board recall
-a new microphone
-a third logic board after the new recall'd one died on me.
then, about a month ago, the wifi was dropping in and out, there were sleep problems, and it would occasionally just not turn on...
so i took it into my campus authorized apple repair centre, they said they 'could' fix it, but i opted to phone apple, with like three weeks left on my initial one-year limited warranty, and slightly exaggerated saying that the repair centre 'recommended i call in to see about the possibility of a replacement, because there could be some heat-affected hardware issues...' after a three or four person run around over the phone, i finally got in touch with a great guy who told me 'id had enough prob's with this model, so he was sending me a new one...'
a week later i received a brand new 2.16 core 2 duo with a gig of ram and a 120 gb hard drive...
between this 'rev' and the rev a, it's like nite and day. i am very, very impressed with this computer. AND my one year limited warranty starts all over again.