the main reason I have it is if I am running a radio so such as a online radio, or certain apps that run gps, there is no easy way to shut them off without task killer.
Same here. I don't have it to "increase performance" or anything. Just as a good and quick way to close a bunch of things that I am not using. I also like it, so that I can kill all of my browser windows at once, while I am at it.
Also, I use Advanced Task Killer, and haven't noticed any problems. Why do people recommend not using it?