They all still work I think, never had to RMA one, anyway.
7100GS - still works I think, came in a system I bought while drunk from ebay, I think it is probably lying in a cupboard somewhere.
8800GTS & 8800GTX - Can't remember the brands, but both bought used about a year after release (for an absolute bargain price), both still worked last time they were used, won auctions on both, sold the GTS to my friend for what I got it for immediately.
560ti - Bought new - can't remember the brand, might have been an Asus card, but still worked last I saw in a friends machine... he has now replaced it with...
Palit 670 blower - Bought new - Still works in the friends system as far as I know.
Zotac 1060 6gb mini - Bought new - Still works. Should probably give that to my friend as it is just hanging around.
Gigabyte Windforce 2070 - Still working in my current system. Bought B-grade from Overclockers about a month or 2 before the 3000 release for what apparently turned out to be a bargain price for a 70 class compared to current prices for them, although does have a small amount of coil whine when doing certain things, which is why I suspect it was returned & B-grade (box and card were in perfect condition, but opened though so who knows)...