Roger,
I use it on a dual core desktop with 1Gig Ram (I know I know - minimalist),
it's so bloody slow.As others have said...it's a RAM hog.
But, regardless of the performance issues of my machine,and as an "everyday user" it looks like MS have produced a Mac Aqua interface clone sitting on top of a security paranoid version of XP!!!!
That's my opinion, I could be wrong!
ps...like the above, I haven't encountered any compatibility issues with my Astro software either so that's a plus!