REI customers are tough....and our first review gave us 4 stars out of 5!
This thing charges (with the adapter) my iphone 10% in about 15 minutes. More reliable than a solar panel, because I don't have to wait for the sun to come out. I precharge it with my computer and then put it in my backpack for commuting and traveling. It works great! BOTTOM LINE: Yes I would recommend this to a friend.