My 3 1/2 year old 15 MB Pro that every component replaced at least once, except the LCD, finally had its final logic board failure and now there is nothing to buy. Even with the Applecare, it really was a piece of garbage from a hardware reliability standpoint.
So, I am using my 2 year old Mini with a 512 SSD and 8GB of RAM to tied me over. As for potability, I finally ordered my first iPad. Maybe I'll wait for another year or so to see what Apple comes up with for the MB Pro.
I cant stop admiring my 15" PowerBook G4 1.67ghz it is soon 8 years old and still kicking strong. I just ripped a movie with HandBrake and installed new XBMC software to it, plays 720p movies smoothly as silk.. Antiglare display, of course. I like the design and keyboard too.
When surfing web, cpu temperature 40-50c compared to MBP i7 hitting 100c under load.. Batterylife is quite good, 3hrs WiFi with old battery..
If it was dual-core G4 with somekind of hardware accelerated video decoding, I could use it forever.