I just had my 4 year old 2012 rMBP fixed for free (graphics card/logic board, so not a cheap fix either) by Apple & personally I call that great service. But I guess you have loftier goals?
Short of the occasional bad "lemon" MBP's hold up great.
Just how long is something electronic supposed to last?
2008 17" (SNIFF) MBP bought used on eBay one motherboard repair ($ 349) after 5 years of intensive use.
Still going strong every day.
Gets a bit hot since I put an SSD into it for the superdrive (500 GB 7,200 rpm HD plus 500GB SSD), but you just prop it up for air circulation and it is still excellent.
Only thing bad is that the batteries do not last, so I no longer bother and run without.
They also swell or pop, blocking the trackpad click ability. Too expensive for what that battery generation does.