Got the update last night, not sure if anything is better or worse on mine as I've not had any GPS/WiFi issues. That said, both before and after, I've been having a lot of issues with websites crashing the browser. They'll load (some don't fully), and then the browser becomes non-responsive. Sometimes the browser crashes out, sometimes it eventually resumes.
Also noticing several apps crashing randomly, especially games. Been trying to play Dungeon Defenders and it crashes frequently and has audio issues.
All this said: Is the Prime *supposed* to come with ICS pre-loaded? I've been under the impression it only ships with Honeycomb, but my unit had ICS pre-loaded -- that said, it was supposedly an "open-box, we-just-showed-it-to-a-customer" unit... (yeah, FutureShop typical BS line...)