I've had 2 Catleaps, and I've used the new Dell U2713HM and Asus PB278Q. A pixel perfect Catleap/Shimian/Crossover/etc. is $400-$500. It's worth the difference.
I paid $290 shipped for my Catleap and it is pixel-perfect. I didn't pay for the pixel-perfect check though because it's a secondary monitor and I would have been OK with it having a dead pixel or two. Even now that's still a $360+tax difference but was closer to $500 back then.