yeah, it's good, but it's buggy. it also confirms what i though anyway - i don't like unified look. it's just not... impressive at all. i'm actually a big fan of how microsoft are making Vista look (even if the registry and the underpinnings are the same as windows 95 etc...). it's looks pleasant and it's a good idea, frosting and blurring the background to make the borders, a very fluid theme that changes when you change the background, and the more windows you have open, the greyer it gets. the system theme changes dynamically. ours is rather archaic by comparison.
Personally I think that Vista is in its "babyshoes phase". The Vista GUI designer make the same mistakes as the OSX GUI designer did in 10.0 and 10.1 by overusing certain effects and transparency.
And remember you need at least a directx9 capable graphics card in order to get the accelerated GUI, effects, otherwise you are stuck with a standard "2D UI" (not to mention the steep system requirements of Vista).
OSX GUI looks and works the same across a wide range of macs, even on old machines like the blue "gumdrop" imac (minus the ripple and the cube effect). Try stacking Windows (the latest effect the developers added, it seems some kind of alt+tab replacement) in Windows Vista on a Geforce MX - most likley not going to happen.
Back to Apple - A lot of things in OSX 10.4 were updated and added without the user's notice. The whole core image/video/audio thing. Sure, most developers will use these parts after a few revisions of OSX (remember a lot of users are still running OSX 10.1, 10.2, 10.3). But the technology is there to create new, usefull, amazing GUI effects.
The next thing Apple has to do, is to update even the low end machines so they can actually (use the graphic hardware to render and) use these effects. Remember, macs are usually have a much longer lifetime compared to x86 desktop systems. So older, or not capable machines still remain and most users won't update to the latest OSX version because they don't see much benefits. Thus developers won't use core image (much) in their apps because there is still the "old/lowend mac userbase".
Semms my logical thinking is messed up. I shouldn't write posts at 1:44 am.