PEPITA This is a joy to use. I've tried all other major bittorrent clients, and thought I was happy with Bits on Wheels, but this one is simpler, smaller, less CPU and memory-hungry (esp. compared to Azureus!), has a very nice interface and most importantly it does get better speeds for me without even having to set up port forwarding on the router. And it's ready from the get go, no complicated configurations.
It could do with the option to download only single files within torrents, but it has an option to stop seeding after a certain ratio (which BoW doesn't have), and even though it's simple it has neat view of all necessary statistics. Very nice job from the developers.
(Version 0.6.1)