It's fairly good. Greatly improved battery and speed performance over 2.1. Over 9 hours I'm getting much 20% more charge retained than previously. Used to be that I would goto work and come home with 35-40% charge, now its closer to 60%. Seems less laggy as well.
As far as I noticed, your app settings, saves, contacts, etc will not be affected by the upgrade unless you screw up somehow during the upgrade. One thing to note home screen shortcuts and settings will be wiped out tho by the stock upgrade. I was so scared about my phone having been completely wiped out when I saw the blank home screen at the beginning. Wasn't until I opened up my apps folder that I saw everything was still there.
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