Sad to hear people say v2.x doesn't work well. I'm still using v1.x (available free on their website) and it's still rock solid and a wonderful tool. Not quite as easy as the newer version looks to use, but a large part of may automated TV Show workflow (Automatic -> Transmission -> Magic Media Marker -> iTunes/Apple TV).
Transmission runs on my iMac 24/7 and never causes problems, never gets in the way, and isn't a resource hog. This is important because it runs on my main (only) computer. It's features make it easy to set up as part as a fully automated workflow as well.
Growl
kjconrad reviewed on 12 Dec 2011
Cyberduck
kjconrad rated on 12 Dec 2011
[Version 4.2.1]
Apple FaceTime
kjconrad rated on 12 Dec 2011
[Version 1.0.2]
Adium
kjconrad rated on 12 Dec 2011
[Version 1.4.4]
iFlicks
kjconrad rated on 12 Dec 2011
[Version 1.4.3]
iVI
kjconrad rated on 12 Dec 2011
[Version 3.112]
iVI Pro
kjconrad rated on 12 Dec 2011
[Version 3.114]
Automatic
kjconrad reviewed on 12 Dec 2011
+1
Transmission
kjconrad reviewed on 12 Dec 2011
VisualHub
kjconrad rated on 12 Dec 2011
[Version 1.34.1]