The power bank holds enough power for more than two full charges of my Samsung Galaxy S5, and the charging speed was very good. It has three lights on top to indicate the level of power remaining. This device is much lighter than most of the power banks I've used, and is much easier to carry in a bag or in my pocket.
I like that it automatically begins charging when I plug it in, so there's no worry about forgetting to press the button. I also love the coating. It's nice and bright and while it looks easily scratchable, I'm pretty rough with my power banks and I'm very impressed that there's no scratches yet!
The one downside I would say is that this power bank has only one USB port, so you can only charge one device at a time. This isn't a dealbreaker, but I do like having the option to charge two phones at once if I need it. That aside, this is a great power bank that looks stylish, works well, and is easy to bring with you on a daily basis.