This is GREAT news.
First, my configuration:
I've got a 2006 17" iMac, running 10.4.11. 1.5GB ram, 1.83ghz CPU, ATI X1600 mobility thingum with 128 megs of ram. I've used both current Crossover Mac Pro, Crossover Games, and I'm currently using the 20080702 unsupported CXGames release. I've seen effectively identical results from all three. Aside from the stability, all of this applies to CX 6.x, as well.
I always run in windowed mode, due to my multitasking needs.
Graphics: Total lack of shaders, due to presented DX level. It makes the graphics very flat, but it doesn't harm functionality in the slightest. Overall graphics performance is quite good, otherwise. Gamma correction.. sorta seems to work in the nightly. I'd like the ability to disable it. It does weird things to the colors I don't like. I see the exact same colors in Parallels when I fuss with that in full screen mode... I think it looks /horrible/.
Sound: Far as I can tell, it's pretty much perfect.
Stability: I haven't had any crashing to speak of since moving to CXGames and the other > 7.x releases. It's run pretty rock solid.
Input: This is to me the really big issue. When you enter any keypress that invokes the text entry box (enter, front slash, semicolon)... The very next character you type is sent off to /dev/null, consistently. Very irritating. More problematic, once you hit 'enter' on a text line, instead of restoring focus to normal play, it /stays/ focused in the text entry box... The only way to get OUT of text entry mode is to hit escape twice sequentially. VERY strange.
Also critically problematic, when attempting to use the mouse to turn your character or rotate the camera, when the mouse hits the edge of the window, the turning motion stops. This requires you to either use the keyboard for turning, which is highly inefficient and causes some trouble with switching a hand between keyboard and mouse (I find keyboard targeting extremely difficult in general), or to repeatedly do short turns, which is even more inefficient.
In my estimation, fixing those two issues will result in full "functionality". The graphics improvements would be a bonus, as far as I'm concerned.