I installed Mepis 8 today, twice.
First was on my desktop, which has a 24" widescreen monitor. It booted up but I was left with nice wallpaper but no icons on the desktop, no menu system and no taskbar. I did manage to click on a terminal -- after moving the cursor several inches off the screen.
Then I tried it on my laptop that has a more common 17" screen. It couldn't even find the screen: it wouldn't start x, nor kde or anything else.
I think it should have gone thru another 4 or 5 RC's (they had already done 4). Don't waste your time.