My gf's phone is a rooted Note. Yesterday she saw a notification for firmware upgrade, which I dismissed just in case. If I install the update, will it lose root/CWM? How could I re-root it back? Is this software update affected by the brick thing when you wipe? Thank you!
Yes, you will lose root and CWM. You can root and get back CWM after updating if you choose to. dr. ketan's mega thread explains how. I rooted after updating but chose not to install CWM.
For those of you who still haven't received the update, you might not get it OTA (from my personal experience). My phone found no update OTA, but instantly informed me of the update when I checked with Kies, so make sure to check both methods.
I didn't wipe after upgrading to ICS, not sure I want to yet. My personal observations are: battery life is a lot better (phone switches to sleep a lot faster now), reception/signal is much better, and the stylus accuracy is better. I've noticed no bugs with Maps
or Music (though I haven't tried using GPS with Maps yet).
The bad things I've come across: 1) I've noticed so far is some very noticeable lag/sluggish touchscreen response, especially when clicking apps/buttons on the screen and any scrolling gestures. It's especially noticeable after waking the phone. 2) RAM load is also noticeably higher than before under normal usage (~100-200 MB more). 3) The phone takes a lot longer to perform "media scanning" after turning on. 4) A minor thing I've noticed is the phone takes a couple of seconds longer to shut down lol. Other than these 4 issues, my phone has been fine.
EDIT: I've found minor bug with the Music player - custom playlists randomly get deleted by the phone...major pain to redo them all. And I can't find where the phone saves them so I could at least try to back them up.