I have to say, that overall I was thoroughly impressed with all of the features built into this product. I have done quite a bit of research on these headphone cases with batteries, watched numerous product unboxing reviews, and read the feedback people have left. After all of my research, I kept ending up on this i-Fuzen. The second time I came back to Sonic, it had dropped from $89.99 down to $59.99 and I thought it was about time to buy it. These are my thoughts...

Upon unboxing it, I was not moved by any fancy packaging or details, however i had already viewed 2 videos on this. The packagin was simple, and thankfully did not require any tools other than my finger nails to open the seals.

The case itself is a strong plastic, with a high gloss black finish. The way the case opens allows the iPhone to be easily put into place without scratching up the sides or the metal around the phone. The plastic feels very durable, and I am confident it will be able to withstand regular abuse that my daily usage delivers. Its slim, and not bulky like my previous brick of a case the otterbox, so it doesnt cause me any problems going in and out of pockets (I HATE the rubber on most cases how its such a pain getting it in and out of pockets!).

When I had the case fully charged, I put it to the test. Typically I will listed to Pandora radio for a few hours while I am tasking at work, and i can usually get til about 5 or 6 and the battery will be less than half (closer to 1/3). If i plan on working on a fantasy team or browsing the internet or even use any apps I would need a charge. After the first full day of work, there was practically NO batter drained. I have gone 3 days off of a full charge, which was FAR better than I have read you typical battery case goes. and after 3-1/2 months its still the same. I could probably go a whole week without charging it, just on regular phone calls and texting, and the occasional iPod playback (though i have not put it to the test ;))

The headphone amp has been the most enjoyable part of this purchase. I mainly wanted to get a case with a battery, and I originally planned on getting the FiiO E6 for portable, and I had not decided on one to keep at home. Since I bought this, I have tested anything from Monster Coppers, to beyerdynamic T70p over ear headphones. I have tried the Grado SR80i and SR325is with the open air design, and Beats Pro. Every headphone I tried with this was even better than before. This headphone amp has 180 mW, which is 30 mW more than the FiiO E6 i was originally planning on getting. And its not like that 30 mW is in compromise with its clarity or anything. It has a nice warm, pleasant sound to it, and is able to fully power everything i have tried on it. The MB Quart headphones i used were 90 Ohm impedance, and this was able to really power my lossless files. Most of the FiiO amps I had tried didnt quite have enough to amp that MB Quart headphone. For most of the larger headphones, it balanced out everything so the mid bass wasnt overwhelming. But I noticed the BIGGEST difference. I Tried Klipsch, Monster, Clarity One, House of Marley, Soul, and many more and I was VERY pleased with how it was able to pick up the slack on EACH different model whether it be not enough mids and practically NO bass, or all mid bass no highs or low, or just missing the highs. I was able to really compare the headphones performing at their peak, as opposed to comparing them underpowered and nowhere near their potential. With the dual headphone output, i could go back and forth between two models, same song, same volume. Excellent. for everyone else, you can have 2 people listening at the same time. Great for convenience, because chances are you and whoever will be listening wont both have an extra battery built in, and even if they do, I would guarantee they wouldnt have one with a headphone amp like this!

All in all, i have been very pleased with this purchase. After the price drop, I would be foolish not to have bought it. The amp alone is worth $40, then you think about how much a battery case is for the phone..... yea, it gets right back up to how much it was priced before. There were a few things on the design I guess I would like to see different, but overall I would give this about a 4.8 star out of 5! Great purchase, and i would highly recommend this to ANYONE looking for any of these features. And if you have never tried a headphone amp yet... This will 100% show you what you have been missing!