Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Almost perfect

Concept is great. Execution is almost perfect, but I had two minor issues:1) The box is big. You won't be able to replace an old outlet with this. I had to put it on a different wall than I originally planned to. For smaller spaces, this one (http://www.amazon.com/gp/product/B007NC5GI4/ref=oh_details_o00_s00_i01) is better.2) It won't charge a BlackBerry without a special non-data cable (http://www.amazon.com/gp/product/B004A8OMLQ/ref=oh_details_o00_s00_i00). The FastMac support people were able to diagnose the problem, but I think this is a flaw in the outlet, since I can plug in a standard USB cable into my other charging devices such as my generic USB car charger or any iphone wall adapter without a problem.