My update occurred today and so far so good. Only complaint I have is the notification options. I don't like only having one sound for everything - I miss being able to set different tone notifications for mail and messages.
You should be able to still change them, but try shutting down and re-starting first. When I did the OTA I was amazed that my wallpaper stayed the same, and my home screens MOSTLY stayed the same (about four icons disappeared), but my ringtones had changed. However, I pulled down a couple of unrelated updates off
Play The Android Market, and rebooted and my ringtones came back.
I'm looking, it looks like text message notification is (and I don't remember how it was in Gingerbread): With the messaging app open, Menu>Settings>Notifications>Notification Sound
For the other notifications, from the home screen, Menu>Settings>Sound and set your default notification sound, but the above will override that one for a custom one for text messages.
For calendar reminders, open the Calendar app then Menu>Settings>Select ringtone
For the clock alarms, it's under each alarm time/day/etc. setting
I use one ringtone for everyone, except Mrs. Unobtanium, a separate sound for texts and another for e-mails, another for calendar reminders, and then another for the clock alarms.