2.2.1 user. 3.x provides a lot of bloat features I don't need as I only want a torrent download client, not a multimedia client; but rather, refuses to implement any feature that actually matters: search in download list, 1 temp dir for multiple destination dirs (could be worked around, but not ideal), etc. What's worse, 3.x has serious cache and file accessing issue, though the performance is getting closer and closer to 2.x, it makes me think that new devs in bittorrent after acquisition don't understand the original code so they mess everything up and struggle to fix them all the way. Not to mention how buggy 3.1 was. 2.2.1 is not perfect: it loses connections after a network interface fail & restart (quite common for dial/vpn/dsl, i guess it's about upnp), and can't re-connect, and it has other problems. But it's still far more better than 3.x version in keeping tiny and concise.