so far no issues, had it for about 2 weeks ... i think it looks great and after 8-10 hours at work i can just press the back button to turn on the battery ( i usually turn it on when my iphone batter says around 18-20%) and it fills it up to 100% . im sure it fills the life of the phone from 0% too i just usually turn it on when it gets to 18% battery life left.
I ABSOLUTELY LOVE THE FACT THAT when you charge the case you are also charging the phone -- this makes it VERY convenient and i essentially NEVER have to take off the case to charge either item unless i want to for some reason.
it comes with a little clear plastic cover sheet which was fine, but i had purchased a tight/clean fitting clear plastic cover for the face of my phone- thats a detail and i didnt even know it came with the cover sheet which was a very nice added bonus.
the case also does not make the phone very bulky at all and the weight is also not anything that changed too much in my opinion either.
anyway i hardly fill these things out but i did because im loving this battery/case and there are so many of them out there i thought i would add my two cents since i read the reviews and took a chance on this product as well. go for it;)