I also have one, and it's holding up pretty well. A month or so ago I broke out my colorimeter and it had almost 100% sRGB at around 120 cd/m2. I don't recall the delta E, but it was very low.

While I didn't measure the backlight, it does seem to not go as bright as before, judging by the levels I set in the OSD. I never went above 70% or so when the sun was shining in the room (not directly on the screen, though), so it didn't have any effect on me.

I understand there are two version, I have the second one. But I don't think there's a difference in the panel itself, I think the change was related to HDMI support.

I can't comment on the latency, the only games I played on it were Civilization and Anno Something. Never had a problem for this.