This product is phenomenal!  I have not had to charge my iPhone for almost 50 hours using the initial charges of both the phone and this battery.  The battery/case is well constructed and comes with a silicon skin at no additional charge.  The battery definitely detracts from the "cool" factor of the phone - it makes it MUCH larger.  If your goal is in looking "cool" when using your iPhone, this isn't for you.  If your goal is actually USING your iPhone for a MUCH extended time period without having to recharge - or keep cables EVERYWHERE you go - this baby is for you.  Check out the current mophie product options and then come back and look at this product again: you WILL buy it!  Great product, fast shipping.