It is a very cool engine – if I was to start a small indie games studio right now in Ireland, I’d get this ( even if it meant getting the coder to have a Mac to build on ).
The potential to build for the web, and for iPhone / Wii is huge for an indie ( of course it’ll cost, but the option is there ).
You currently need a Mac to edit on though ( but you can publish for PC .EXE from the Pro version, and the web plugin will play both Mac and PC ).
If they bring out a Windows IDE ( has supposedly been worked on for ages now – remember that these guys are Mac heads ), I think you’re going to hear a LOT more about it.
Mal