Where I once had max bars, I now have one bar. Where I had 4g, I now only have 3g and with only 3 bars max. I've dropped more calls since the update, then the entire life of the phone (Nov 2011). I really like the update, but I hope there is a fix for the antenna. Not just my phone either, I work with 4 other people who have same phone and have same problems.
On another side note: Did they remove the ability to hide apps now?
Yes, ICS is not helping the radios in the phone. I normally get 5 bars at home, now I am barely getting 2 or 3. ICS is not too friendly with the radios. I don't know if others are having the same issue or not.