AZPEDR  I already figured this software was a nono when I kept seeing over and over again that the developer must've failed his/her high school english classes...

Even after you try to uninstall it there are processes that you need to manually stop with Activity Monitor or the Terminal. Save yourself 20 minutes of your life that you'll never get back and find another program...  
(Version 12.2)

AZPEDR  Well, I get the exact same speeds out of both Azureus 3.0 and BitTyrant 1.1 , but in BitTyrant it's much easier to achieve those speeds. Basically all you have to do to get decent speeds is mess around with the upload limit until it seems like you've hit a hotspot in download speeds. I do this in both programs... but in BitTyrant I always have to upload more to get the speeds I want, which isn't a bad thing (leechers annoy me).

In Azureus it may even be possible to get your speeds even faster than BitTyrant, but it would really be too much trouble (have to keep messing with certain settings). BitTyrant does a relatively decent job with a fraction of the trouble.

At the same time, I too have had trouble with UPnP, and the GUI gets a little glitchy sometimes (I'm running OS 10.4.9). It just barely isn't as stable as Azureus.

All in all, I'd recommend this program above all others...  
(Version 1.1)