I've had my Droid X since July 1 and immediately installed Advance Task Killer and used it for a week. I only had it set to kill certain tasks/apps and nothing that had anything to do with the actual system. I then uninstalled it and have gone the last 5 days without it. I'm finding that the system runs smoother with fewer, if any, "hiccups" without using the task killer. I just thought I'd let people know since the X will be out in 2 days and I know the task killers are a big thing but I really think things run better without one installed.