I also had the 15" 2.2ghz 8600 MBP until recently. I'd had a new Logic board, new screen, new keyboard & track pad, new bottom and top casing, along with countless 'fixes' for various faults ranging from the dreaded black screen, all the way to persistently failing ambient lights and screen discrepancies.
After 2 years of going back and forth every other weekend to the Apple store, I finally put my foot down and requested a replacement model. Much to my surprise, they agreed and I'm now the happy and proud owner of a 2010 core i5 2.4ghz MBP

Could not be happier, it's the powerhouse my previous gen never quite was.
Thank god for Apple care, that's all I'll say
Bizarrely enough, after all the expensive stuff, it seemed to be when I drilled a much more basic point home that the guys at Apple turned round and agreed. The ambient light sensor, a basic function that continuously refused to work, each time I'd have a new fault, I'd bring back up the same old ambient light issue, where by the keyboard wouldn't illuminate in low light as the screen dimmed. A feature that I wouldn't bother requesting a repair for unless/until coupled with something else. It must have been 'fixed' at least a dozen times, by the Apple techies. It was then, when I homed in on the fact that amongst this constant flow of seemingly endless issues, a mind bogglingly simply led system was unable to be 'fixed' by a team of top certified Apple technicians. This fault, I explained, was ironically the most consistent feature of my MBP at that time!!
All in the past now though

Happy days!! Good luck guys and gals!
