I see, you have been very unlucky
I have to agree that when there is no profile for CFX or SLI the thing is going to get screwed because you ain't getting playable framerates.
I can't say I've had the same problems as you but I have had some (especially for being an earlier CFX/SLI adopter) and still I guess I've come out with a positive balance about it, especially because when everything works it outweighs the cons.
Still, It takes a lot more money and effort to get good framerates at 2560x1600 than 1080p, I agree with you and I damn feel your pain
Of course the issues that persist are app-depedant. Some work fantastic, others...well, you get the point.
My 3008WFP that replaced the 3007WFP that I originally bought has amazing color, but I also ahve IPS monitors for eyefinity, so that's not that big of a deal.
To me, it makes more sense to get a 32-inch 1080p TV than a 30-inch monitor, as even costs are much lower. That way you get the same overall view-space as a 30-inch, even a bit more, but none of the problems that come with running 2560x1600.
I can't knock 2560x1600 for desktop work, as two full browser pages will fit on the screen ,and it doesn't work as well @ 1080p. BUt running dual 1080p or triple 1080p is jsut as useful, to me. When working on a review, I can have TPU open on one, Word on the other, and Photoshop on the third, which has greatly reduced the time I put into doing reviews, simply becuase I'm spending little-to-no time switching between windows.
2560x1600 is really nice, when running well, I cannot deny that. As long as you are prepared to deal with stuff, it's a minor issue, but I always feel it's best to be prepared for hte worst, but hope for the best, just in life in general.