Purchased this for all the right reasons and it looked a well finished product in the description, however a few things have been disappointing as follows.
The instructions are so badly translated from Chinese its not worth reading them, they don't give advise on first charge times, weather to run flat before recharge and how to get maximum performance from the device, they don't say what the blue light on the side shows nor what the button does... so that's very poor
Secondly although it looks well finished it could have come with some sort of protection such as a felt bag or plastic wallet, it will soon become very scratched and shabby as it is.
Thirdly the cables are not as shown on the Amazon web site, you get one cable with multiple (poor grade) attachments for many devices, this is actually better as it give more flexibility of use however they come loose in the box and without a case or storage box.
I've charge mine for over 24 hours and the indicator which thay make such a big thing out of only show 3 of the 4 bars when i press the button, so either it wont reach full charge in 24 hours or the display is not working correctly.
Saying all of that, it charges and iPhone 4S, iPhone 3, Ipad 1 and 2, Nokia E70, Blackberry Bold with speed which is exactly what its designed to do.. So Yes if you need a back up power source its perfect, if you are buying it cos it looks the business, it not so perfect