I've had ICS on my Nexus S for a few months now and I've not seen issues like that. I'm just using the standard Google image (AFAIK, my brother did the upgrade

I've had ICS on my Nexus S for a few months now and I've not seen issues like that. I'm just using the standard Google image (AFAIK, my brother did the upgrade for me - Android 4.0.3, kernel 3.0.8-gb55e9ac). I do see a lot of battery drain when I'm using the GPS, and I don't play games, but no crashes.