I found Azureus poor compared to other clients (ABC and G3). Very resource hungry, poor file allocation strategy, and slower downloads. Maybe I didn't have the best settings, but ABC works "out of the box". I'm also running Folding@Home, which may explain why a Java based client doesn't work too well for me.
G3 is a pain for restarting (seeding) completed torrents if you use any of the "Folder" options. They seem like a good idea initially until you find these problems. It is a bit buggy too (especially when resuming paused torrents) but I keep it because of the ability to download selected files.
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