I prefer my old IIyama CRT for playing games, if only because the black colours are actually black. But, for anything else, my new IIyama LCD is brilliant.
Iv spent ages getting my games to look exactly like they did on the old CRT, the colours are exactly the same but even now the blacks are a dissapointment. There is always a very slight glow from the screen (only on dark images and more noticable on the top and bottom edges) so blacks dont appear 100% black even though its a good quality monitor.
I wouldnt like to light a level in UnrealEd with my new monitor though, that for me would have to be done on a CRT.
Anyway, for games development (art/textures/3D) its still far superior to the old CRT an mouch clearer.
I have so much desktop space now, I dunno what to do with it all!