I updated to 2.1 this morning at work. Everything seemed fine. I don't know that I got any better 3G service since I have never had a problem at work and I don't have 3G at home so I will reserve judgement until I can try an are that I know has dropped calls. I did try running speed test and both 3G and EDGE speeds were about half what they usually are, but the have been known to vary wildly also so I will wait and see on that also.
I just tried syncing at home for the first time tonight. The initial backup which used to take 10 minutes or more was very fast, as was the syncing of contacts...but then it started REMOVING about 20 of the apps I had downloaded or purchsed from the AppStore. Since this was the first time I had synced since the updated I thought maybe it was going to remove and the re-install them...but NO...after it finished removing them it said syncing was completed...WTF!!! I have synced both at work and at home everyday since getting the iPhone and never had it remove any apps! The only apps that it did not remove were the 4 or 5 that were on the "Applications" tab in my iPhone information on iTunes.
I tried going to the AppStore from the iPhone and re-downloading one of the apps which it let me do telling me that I had already purchased it. After doing this I synced again to see what would happen...it removed the app again! I then went to the AppStore through iTunes and downloaded the same app again. This time it listed the app on the "Applications" tab and did not remove it when I synced again. So I thought "No problem" I will just download them all again through iTunes...only problem is it now wants me to re-purchase about a dozen of the apps that I had already purchased...and its not the 99 cent ones!!!
Has anyone else had this happen?...anyone have any ideas what to do?