I just picked up one of these from Amazon for about $20. What few reviews were there are mostly favorable. This is the model that will run off batteries or your 12v cig lighter. I plugged it into my jumper pack and was surprised by the amount of air that it moves (10in blades), but my wife was impressed with how little noise it made. Best of all, it has a low amperage rating. The box says 500mA on low, but it comes with a 1A fuse, so you know it wont draw much. At that rating, my 35w solar panel should keep up just fine. Has anyone else used this product?