If you like tinkering, you'll love it,
if you want it work, you'll be lucky,
although it's kept me amused for hours upon end.
I would highly recommend OS X for users who are self-confessed Mac Geeks, or Unix Geeks, or just geeks, trouble is that this is simply PB version 2.
The whole concept is to get the Egg out before the Chicken, the Chicken of course being mid-summer when OS 10.1 is out and Photoshop et al are released. (This is a release for the developers and enthusiasts, not for general use, it is currently way to limited for that.)
Buy it for novelty value alone and the fact that you can finally get a 'free' update when 10.1 is out!
But make sure you've got over 200MB of RAM!