wait....the Cloth Simulator is optional for MAC users?

Only in the sense that you don't have to upgrade to Poser 5. The cloth room is a basic part of Poser 5 on both platforms.

Fewer bugs in Poser 5 on Mac on initial release, mostly because it was done later and includes the first 3 rounds of patches from Windows. There are still some annoying bugs; I've had some crashes, and it's pretty slow in places, and a few scenes seem to cause the Firefly renderer to just give up and render black for half the image.

But the hair and cloth rooms are awesome. Not that cloth couldn't be improved a lot. It ought to be able to resolve initial position collisions on its own, for example; which would be really nice when moving clothes from one character to another.

But with a long flowing dress, dynamic hair, and a wind generator... it definitely makes the upgrade more than worth the cost and occasional hassles.