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I've used Anker chargers for many years now, and currently have three different ones in my household. Considering how much capacity this charger has, it's incredible how small it is. It works great overall, no issues noted with it so far. I included photos of the three chargers I currently own. On the left is the older 10,000mAh charger, right is the newer 20,000mAh charger, this charger in the middle. This charger is much smaller in length and slightly smaller in width, but slightly thicker. It has the same profile as the 10,000mAh charger but significantly shorter. I used this exclusively to charge my phone (LG G4, 3000mAh battery) for a few days to see the performance of the charger. I used it to charge my phone both without use and with use. The first charge was without use. It charged my phone from 5% battery up to 100% battery over the course of only 1 hour and 18 minutes, surprisingly fast (1.2% per min). The next charge I did was during typical use, bringing it from 14% to 90% in 1 hour and 13 minutes (1.05% per min), not too far off of the charging rate without use. The last charge was mainly while using the phone as a GPS in my car. That brought the phone from 6% up to 94% over the course of 1 hour 57 minutes (0.75% per min) before the charger was finished. All things said, the charger worked amazingly well, much faster than the previous iteration of the 10,000mAh charger and much better than I expected. I used the charging cable that was included with the charger for this test, but have been using my own cables since then as I have much shorter cables that I prefer for some cases and much longer cables for others. Also the 18 month warranty is another feature that keeps me purchasing Anker products. I have had an issue with an older charger with a built in cable, and while the charger was no longer available for sale Anker sent me a voucher for the full value of my charger, which I was able to use to purchase the older 10,000mAh charger you see in the photos. Every other charger I have owned by them has had zero issues over years of use.