I tried several other BT clients on my PowerMac Dual G5 and settled on this one because it seems to DL quite a bit faster than those other apps. I have left it running, both seeding and downloading multiple torrents for weeks and have never seen any problems with freezing, filling virtual memory, or hogging CPU cycles. I can't say what happens if you have to force quit this app because I haven't had to do that. The only thing that I do manually (that I wish the program did for me) is to cancel and restart all of the active torrents about once a day. When I do that, it often finds additional seeds and/or speeds up the active downloads. It doesn't do it every time, but I'm convinced that it does it a lot of the time.