Does this actually use the uTorrent engine? I heard rumours earlier that it would use libtransmission.
The GUI looks fairly impressive too, using the iTunes\Finder\etc style layout. uTorrent was my favorite torrent client under windows, when i began using OS X, that was my one missed app.
EDIT: Well, now that i have used, it's performance is really nice. Torrents jump staright to full speed, and trackers update much faster, unlike Transmission which required 3-5 minutes. The information pane isn't very pretty yet, espescially the files and peers tab. I remember more tabs, so i'm expecting that in the future. The built IP filter feature and dock badging from Transmission would be nice too.