how good is this 18600mAh battery pack from zerolemon @ 49.99 USD?

[qcellhk]

I'm looking for a backup battery pack for the iphone 5s 16gb. I looked around and found one at 18600mAh capacity battery pack for 49.99 USD with shipping. Anyone use this before? It's pretty low price for the battery pack

http://zerolemon.com/product/zerole...r-with-total-3a-output-dual-usb-output-black/

 

[jayrflow]

These things were just announced last week. Give it some time so people can get them and try them. It does look nice. I bought the 20,000mAh battery from Anker for almost double the price! I'll also be looking for a review in case I want to return this