Well, for the first day or two ICS seemed very sluggish, but it seems to have sorted itself out. The battery life is not as good as it was, either.
The bug which is bothering me the most right now is that the menu buttons won't stay lit! The off, 2 second and 6 second options work fine, but the "always on" option only works until the phone goes to sleep, then the buttons never light up at all. This is very disheartening since I use the phone in poorly lit areas and I need them lit so my old eyes can see them.
The other real disappointment is the new email app. If it were any slower, I'd think it was hand sorting index cards. I try to mark a bunch of emails as "read", and it takes 30 seconds and I can see them mark off one...at...a...time. I've just loaded up K9 email, which is fast and slick. We'll see if its other features pan out.
The other bothersome things are more opinions than actual bugs. For example, the recent app list (holding down the menu button) used to be a nice concise list, and now it has these big, clunky screen thumbnails and it can only fit 3 on a page. I want my old list back. Same for Favorite Contacts, which used to be a nice list with small pics, and is now monster sized pictorial tiles. No good, guys! Then there's the power control widget which is twice as large as it used to be.
All in all, my phone was slick and functional in Gingerbread, and clunky and slow with ICS. Anyone know how to go back????
Mike