My biggest complaint is the kickstand is positioned such that you can't charge while the kickstand is in use (well you can, it just defeats the purpose). This is more a minor annoyance than anything though, as I don't really need the kickstand ever.
My battery is now going on 25.5 hours and has 16% left. I was mostly on wifi during this time so that seems to be a huge battery saver. If I am on the road or out of a wifi zone it seems to drain more quickly. Juice Defender claims it saved 1.24x battery, or 24%, but not sure if this is accurate.