I also moved from a windows machine to a mac earlier this year, and am trying to avoid installing Parallels or other software in order to run Windows programs. So far so good. I've been very happy. The biggest challenge of this conversion is genealogy software.
I've been working with iFamily for several months. I generally like it for purposes of data entry. However, its reporting functionality falls far behind Family Treemaker. And I'm at the point in my research where I need to do pretty in-depth analysis of data, comparing different branches, etc. For example, I've started a one-name-study of early Taylors of Massachusetts (1630-1700), and iFamily is worthless for such work once the data entry is done. Familytreemaker would have been better. Or Rootsmagic would be even better, but neither is available for the Mac, and as I said, I don't want to go the windows-on-mac route.
I've just downloaded Reunion's demo, and started mucking about in it, and may go with it, but thanks to this topic, I'll also try Heredis which I had not heard of. I had looked at MacFamily Tree, and like others, didn't really like it.
By the way, the support for iFamily is pretty good. The developer makes himself available through both email and a message board. He makes fixes and updates pretty frequently. That said, he has an approach to software development that seems more focused on a "perfect program" (from a programmer's perspective) rather than based on user needs and requests-- encouraging users to change their practice to fit his software more than making available features of the software to support the work of the user. I think RootsMagic (on the windows side) is similar. That said, iFamily is a nice program-- and for those looking for an Apple/Mac experience, it really is it.
But I've reached the edges of its usefulness for me-- and in less than six months; I need something better.