I updated a few hours ago without any problem. It took quite a while so I really do recommend to charge your battery before doing anything, you don't want the update to be cancelled in the middle.
The phone is faster, videos don't blink anymore on the start. Other than that I can't say as I didn't have any other problems really.
Yeah, after the update and restoring the backed up data I still miss a few applications (e.g. Screenshot). It got totally deleted. I will write more about the update process at the Nokia E50 website.