Just got my Hyperion battery and with the battery widget it came up as a 2750mAh battery instead of 3500 like they claim it to be. No big deal and for 20 shipped you can't beat it.
I didn't have any issues with the battery door not fitting right or it not picking up 4G. In fact, 4G has been working just like it did prior to the switch. No dropped calls either. So far so good.
It's on the charger now and when it fully charges i'm going to restart my phone and keep charging it and then drain it to see how long it lasts. Ill report back tomorrow.
FYI, i'm still waiting on my Seidio extended battery to come in so there's more to follow.