I've started using it the last month or so, ever since I upgraded my monitor. I don't know if a new
monitor helps with performance, but it seems to have for me. The only thing I still don't understand is why I can't get the rainbow-coloured horizon that is shown in other people's screenshots. My sky is blue most of the time (not brilliant blue) but when the sun starts going down it just goes from blue to darker blue to black, no pretty colours :shrug:
I use Fellout Full, and my nights are dark but not really really dark. Maybe it's the night sky mod I had before. I removed that but the stars and moon textures remained behind. The moon is large and bright. Sometimes I do need to use night vision, but only when the moon isn't around.
I guess my only gripe, as lame as it is, is that I don't ever see colourful skies around sunset. Other than that half the time I forget I'm even using it, and I haven't noticed any performance issues. I lag often but it's more due to MMM and my texture packs than anything