Although they only make a Windows version currently, I was able to use the Oloneo Photoengine on a Virtual Machine on my Mac. (Using VMWare Fusion) I'm very pleased with the results I get from this software and HAVE been a long-time user of Photomatix before this.
I post a review and video of it on my blog here: http://www.modifiedphotographics.com/2010/11/02/a-review-and-tutorial-for-oloneo-photoengine-hdr-software/
Another option that I've found to be very good and inexpensive for Mac users only is HDRtist Pro from Ohnaware, which I've also been using quite frequently with very nice results. http://ohanaware.com/ I haven't done a review on this yet, but it's on my "to do" list.
There are no rules for good photographs, there are only good photographs. - Ansel Adams
My photography blog, Photoshop tips, color tips and more: http://www.ModifiedPhotoGraphics.com