well, i'm glad you asked. battery performance for me is much improved with heavy and i mean heavy use (gps, bluetooth [which now works flawlessly], web, music, and video all throughout the day and i have no problem lasting till i go to sleep. no more mid-day charging!
multiple days is totally out of the question, though. getting about 12-14 hrs. the best improvement besides battery is the proximity sensor, it actually works well now. there is now very little to no delay when moving the phone away from your face when on a call. the screen turns right back on and i really love that.
btw no zip file on my card either, and i've asked other people i know with it and they don't either. kinda strange, maybe samsung had more dirty tricks, and added away to automatically delete the file once installed or it saves somewhere on internal memory. idk