Obviously, every torrent client has its pros & cons. This one is reasonably fast and seems quite robust and bug-free.

Instead of opening a separate panel window for every single torrent download, I'd prefer a table display as in BitTorrent 4.1.2, but the download behaviour of the latter program is considerably less stable and the windows do not update correctly after download resumes or drag & drop operations.

At the moment, I prefer Tomato as the least annoying compromise between reliability, d/l speed, features and ease of use.

Bits on Wheels has a much more elaborate GUI but the downloads are terribly slow and the program excessively abuses disk space.

BitTorrent, on the other hand, offers the fastest downloads I've seen so far, but the GUI, though very well designed, is rather poorly implemented and buggy (windows don't update correctly).