Initial impression is that it's, overall, very good. The screen is slightly smaller than I expected (even though I did measure it out beforehand) but nice nevertheless.
The clarity is superb and I've not quite played with the monitor colour settings yet, but out of the box it wasn't too bad, just a little bit blue and too bright.
However, it's not quite perfect, I can see a cool blue tint on the left side which a lot of people have mentioned. I'm trying to decide how much this bothers me as it's only really noticeable when looking at a solid white or light coloured screen.
There's no dead pixels and I don't think there's any noticeable backlight bleed, however it's not really dark enough in this room yet to fully test/see. The IPS glow is slightly more noticeable on this Dell than on my 20" iMac G5, I'm not sure if that's because it's wider (so the viewing angles to the corners is greater) or just the IPS on my iMac is slightly better. However, the viewing angles are about as good.
I'm also coming straight from a 19" Iiyama HM903DT CRT that I've been using for a long long time. I can definitely see some difference in games (I've only briefly played Left 4 Dead 2 and Flatout 2 so far), the framerate is high enough, but just doesn't seem
quite as smooth (maybe I should've bought a 120Hz monitor
). I'm sure I'll get used to this though.
I've currently set my CRT and Dell in clone mode so I can do a direct comparison, using tests like PixPerAn, Prad box test and the Eizo test, I can definitely see some slight blurring and ghosting/overdrive. However I don't see it in actual games that I've tested (mentioned previously). I've read that with the transition from a CRT to LCD, you'll always see some blurring regardless of response rate or panel type. I don't think there's any input lag that I've noticed, but I will do a stopwatch/counter test later.