I've been using this since I received email notification from the µTorrent Mac development team letting me know the first beta is available, don't tell mgr.
It's available for all to download.
The goal of the µTorrent Mac development team is to bring the Mac version inline with the Windows version feature wise, as well as add some additional Mac specific features, from what I read while browsing the µTorrent Mac forums. So far, it's already been through 3 updates.
Initially µTorrent Mac was based on libtorrent, but the development team decided to make the client a port of the Windows version.
It currently lacks many of the features that the Windows version has at this time, most of the columns work and a few are non-functional, and the GUI sure is purdy and all Maccy-like.
The Mac version works quite well, especially for first betas.
I can't wait until the next update is released, they've done a fantastic job thus far