I have used Yoobao ( original), Pineng, Power rock ( Apple highly recommended ), Energizer, Anker n Limeade. The Limeade is obviously the best : in build quality, charging speed n consistency. I only carry it out with me on my overseas travels. Next up is Anker n Yoobao. Surprisingly Apple recommended PowerRock is much poorer.
You can only get Limeade through Amazon n the 18000mAh unit cost me about rm380 ( inclusive delivery). It should be cheaper now as I bought it more than a year ago

I bought 2 Xiaomi powerbank from their online site n hate to say is one of the worst powerbanks I had used. I suspect their battery power is over declared
Battery drain is way much faster than my others
I had compared it with my other yoobao, limeade, and pineng

This post has been edited by benny888: Dec 6 2015, 09:40 PM

Only good - it is cheap. Anyway you pay for what it is worth. I only used it rarely these days