IMHO NVIDIA Surround is dumbed down and feature limited. I'd suggest just working out your driver issue with the 5870. I run both GTX470 Surround and an Eyefinity 6 card. Neither of them are problem free. I think it's a case of hoping the grass is greener on the other side when neither side is ideal. My personal preference would be to have 2 Eyefinity 6 cards over my 3 GTX470s.
I would actually agree with the point "the grass is always greener"... I find myself wanting to pick up a 6970 to try EyeFinity, but I'm fully aware that both have their own problems. Particularly tri-SLI Surround seems to have a few more issues than just dual.
CY:G - the only game I've found that has serious issues with SLI is Amnesia: Dark Descent. Most other stuff is OK, although I do have a number of games (Shatter, Magic: The Gathering: Duels of the Planeswalkers, Battlefield: Bad Company 2 spring instantly to mind) that have some fairly serious woes with Surround. The first two load OK once, but from then after crash the system completely when trying to load them, the latter is a lot more unstable with Surround.