Since upgrading last week to ICS, my GPS takes forever, sometimes I can't input text into emails or sms messages without restarting, and my battery life seems cut in half. I used to be able to turn off GPS manually but that doesn't seem to be the case anymore. No more on/off switch in the notifications area, and my GPS on/off widget seems to only be able to work at certain times. Plus, when I open Task Killer, there are always dozens of open apps that I didn't open. This was not the case before the upgrade. The positives are great, but I'm going to consider a factory reset and go back if I can't solve these issues, which greatly outweigh the new features.