oberkc said:No problems here with the upgrade. Don't know how long it took...I went for a run and it was done (waiting for me to sign in) when I returned. I know it was less than 40 minutes.
For whatever reason, some of my apps were not checked to backup during sync (little checkmark in iTunes) and they did not show up after upgrade. I had to add the checkmark afterwards, then all was well.
Syncing via wifi for me seems slow, but it appears to work. I have not tried the cloud.