Azeureus froze my dual-processor g4. It took me about a week to figure out that was the culprit. Tomato Torrent is not really comparable to Azeureus, but for basic functionality of downloading torrents, it does the job.

It has crashed a couple of times randomly, but at least it doesn't freeze my computer. If you have more than a couple torrents going, your desktop can get very busy with all the progress windows (each torrent opens a new window).

Best thing I like about this app: the dock icon.