I downgraded from a 3007WFP to a U2410. I wanted the extra connectivity (HDMI, DP, extra DVI, etc) and did not want to pay for a U3011. There is a very big difference in resolution and it's noticeable right away, as you lose a lot of real estate.
It's kinda tough to play SC2 on high resolution screen if you're used to something smaller. To keep MP even what you see is the same regardless of resolution, so on a higher res screen everything is bigger. This is one of the reasons why SC2 doesn't support Eyefinity.