iOS 5 rocks. However, for those of you who have been able to upgrade without much of a hiccup, I suggest that you take time to get to know it.
It's not easy nor it is difficult. I think the difficult at times at this time for some people, including myself, is the load of traffic hitting Apple's servers and the Internet in general.
So, I suggest you take the time to get to know your new iOS. I have and I'm loving Find My Friends (I guess I've got the stalker personality) and iMessage.
I'm having some trouble with Notification Center - I don't see my weather or stocks.
And generally, updates are coming in, albeit, slower than it was yesterday.
So, again, be patient with the updates and get to know your iOS. Once you get the hang of it, it'll blow you away.
I can't wait for my iPhone 4S (in Kentucky of all places now) tomorrow. Siri, you and I are gonna get to know each other well.