Let's preface this by saying first and foremost you're getting a 10,000mAh powerbank for around $30, which is typically what a good 5,000mAh goes for. It charged a near empty iPhone and used around 30% of it's own capacity, so expect around 3 charges depending on your device.
It's already an established value, so lets talk about all the little things that really make this great:
1. Built-in Lightning and Micro-USB charge cables, plus an adapter for Micro-USB to USB-C. What good is having a powerbank if you don't have the right cable? Everything is all-in-one, and I'll never go back to another design.
2. Built-in Qi Wireless Charging, normally a Qi wireless charger pad ALONE goes for $20+, here you get one built in. While not a huge need for me when traveling, it's still more convenient to be able to pick up the phone - use it - then place it back down on the charger without having to plug/unplug or deal with wires.
3. A useable capacity display, many other powerbanks use 4 LED lights to indicate charge so you have to estimate (usually something like 0-25%, 25-50%, 50-75%, 75-100% for each of the four LEDs) but in this case it states exactly what the current capacity is.
4. Multiple (3) different charging inputs - this is often overlooked. There have been times when traveling when I used the powerbank but later realized I didn't have the micro-usb charger/cable etc. and/or only had a lightning charger - with this device you can charge from Lightening, Micro-USB, or USB-C.
Quality of the materials is good, if not on-par with more expensive brands - but at this pricepoint they are above expectations. Eventually I'll wear out the built-in cables and/or connectors but I'd rather just spend another $30 at that time to replace it (and get a fresh battery).
TIP for those who don't use them often - DON'T leave your powerbank fully charged, if you rarely use it (once or twice a month) keep it at around 80% charge, Li-Ion batteries last longer (age slower) if you keep them in the 50-80% range as opposed to stored 100% full.