I'm Happy to see this update as a Sprint customer. It doesn't enable some of the features people want...like MMS...but it's an official update nonetheless.
I've successfully loaded it on my phone, and it's loading on my wife's phone, but it's taking quite a while and that has me stressing (I can eff up my phone any old day, but if hers gets effed up, it's my arse).
I'm sure it'll be allright. It's stuck on a screen that says "Connecting to Device", but it's gone through a goodly portion of the upgrade already.
Edit: it was doing all of the phone-side processing when I posted. About 3 minutes later, it rebooted and began restoring the apps and messages.