Never personally used it. Transmission however is another torrent program that works great, it's simple and user friendly. Also it's pretty nice on the memory aspect.
I personally use Vuze (formerly Azureus) and it's downloading something right now and I'm using about 119MB so no matter what you're going to be using plenty of ram during downloads but either way I would recommend Transmission and Vuze and then a legit version of uTorrent when it comes out for mac.
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