I bought this for the HTC Incredible. It seems to work well with the A97 tip. I have not done a full charge with the IGo, but topped off an 83% charge. I bought this for use on long plane trips. The one down side is that when you use it, you have a "large" battery pack hanging off your phone, or whatever devdice you are charging. The many up sides are, with the correct tips, you can chagre many devices, another is that it uses AA batteries, available almost anywhere. I have heard you can buy an "extention cord" for this, but I not looked for that yet, so it would not be hanging on your device. If that was built in, I would have given the full 5 stars.