I'd probably buy it to give it a go. Mostly because I'm in "give it a go" OS mode right now - I just installed Linux (ubuntu) at home as a dual boot to XP (its great for everything but gaming and those pesky websites which don't work properly in Firefox - I problem I have with XP anyway).
I've also spent waaaay too much time fiddling with themes, object dock and Konfabulator in XP to give a degree of OS-X look/feel/functionality (?) to XP. See the screenshot below (clicky for bigger - Pelican won't let me do full size)
