I love all the customization Azureus offers. SafePeer is especially important to me, as is the ability to use other plugins. I also like the way I can bias my up bandwidth toward towards certain torrents (like ones with few other seeds or Mac-oriented torrents). A lot of people are mentioning footprint, so here are my numbers: it sucks up about 220 megs of RAM and 15-20% of a single G4 500MHz processor. OTOH, you can run it on an old machine, like a beige G3, and just let it sit there doing its job. Some people might be intimidated at first by all the options, but the set-up for basic use is only a few steps that are well-explained.