I have one of the Halo ones from QVC. I like it a lot. I did buy the most expensive one because I use it for work, but I like that it can charge any thing with a USB.
I use it for my phone, kindle, bluetooth headphones.
It holds up really nicely and keeps a charge for weeks if I don't use and probably can do a full charge 3-4 times when I do use it.
I have a brick one, my brother has a lipstick shaped one and we both love it. It's my new go to gift for people.