Chaps.. I have an iPad 2 and downloaded ios5 last week... oh i really wish i hadn't, i've had nothing but trouble from it. I love Apple and have done for many years but this at the moment is the worst thing they have produced!!!
Don't do it yet.. wait for the next update.. i've done all of the things on the forums, reboot from new, clear the cache memory etc but i just can't find any way of going back to the previous version.. doesn't look like you can
I really really really really wish I hadn't gone to iOS 5, it's ruined what was a brilliant iPad.
The biggest problem is Safari, it keeps on crashing, can be 3 times in a minute, you are writing a post and then it's crashed before you can send. or just browsing and it closes. It's getting to the point where I'm just not using it. Fecking crap software. Of course it's up to you, but at least I've warned you.