I picked up one of these on sale recently, and was pretty impressed with the product.  I've been able to squeeze about three full charges for my iPhone 4S out of the device. The included LED/laser combination is probably pretty nifty if you already carry those around, although I haven't found a need for them in my experience. There's a single multifunction button that is used to both control charging as well as the included LED/laser, and it took me a little while to get used to the controls. The battery itself charges through a standard microUSB cable, and the rated 4-5 hour charge time is accurate in my experience. For the price and form factor, the IMP52D provides a solid, respectable product.