The customer service is exceptional! But the actual product? Not so much :/From the beginning I had issues... The first purchase I made on this battery case, the push button (to charge or stop charging your device) was super sticky. I left a review and then I had someone contact me and they said they would ship me a new one, and they kindly asked if I could edit my review upon receiving and trying out the new one. Fair enough, so I did.Unfortunately, the second one wasn't much better... I noticed after about 2 months that my phone became fairly difficult to start putting into the battery case. I decided to put the two cases side by side and the first case was easy to put my device in or out of, but the second one was hard. Confused, I decided to ignore it and just keep using the second case. After another month, it became nearly impossible to move my iPhone 6S into or out of the case (I keep my device always between 20-80%, and therefore charge my device only at night time instead of my phone). Turns out, the battery on the second one is actually the culprit.If you look at the attached picture (if possible), you will see two battery cases. Both are this product I am review, but you can notice that the one on the left looks exceptionally thinner than the one on the right. As you can see, the battery looks like its about to explode put simply.Moving forward, that wasn't the only issue I had... If you also look closely, see how the left case has a hole in the case on the LEFT side, and then the right case has a hole in the RIGHT side (also there is one on the left side but you can't really see it in this picture)? Turns out, the plastic they use to make this isn't durable whatsoever. These broke within a month, but I never left a review because to me it's not a big deal.However, adding this into the poor battery selection when manufacturing this battery case proves to be an indicator that they do not use highly expensive manufacturers during the manufacturing process, but instead they look for the lowest bidder, which is fine, every company does this. What bugs me the most is how they can price it so high compared to what value you actually receive from the device.So put shortly, if you only intend to use this battery case for a month, then this is an exceptionally good buy as you get a crazy amount of added battery life added to your device. The customer service is still exceptionally better than the norm and the pricing isn't all that bad. However, if you intend to use this daily? Expect to purchase 2-5 per year, depending how long the case lasts.I'm sorry, this is a great idea and could be a exceptional product, however the manufacturing decisions used seem to state otherwise :/