i got this because of the price, and its got a good battery life on it. but i was most impressed with the amplifier in it. i was planning on getting a little amp for my headphones like the fiio or boostaroo, but this was more then sufficient. i have the klipsch reference earbuds, and they are good headphones to begin with. now i understand all the reviews people were writing about them. the sound has really filled out, and there is nothing lacking. the bass is far more present than i had anticipated from the tiny little port they are equipped with. even when i tried using the regular iphone headphones..... WOW. no need for the portable headphone amp now.

oh yea, and the battery is great also. i went 4 days straight without a single charge. and thats with regular usage. pandora would usually drain my battery every day, but now its like i got three batteries.

overall, this was far better than the other battery cases i have tried before. most of them were just another poorly manufactured piece out of china, but this one truly did everything that it said it would. and they seriously under sold me on the headphone amp. i would have paid that price just for the clean, full, sound out of my headphones, mix that in with a battery and case, SOLD!