As a frequent traveler, I though this device to be a great help to charge all my devices. Its also one of the few USB chargers that supplied sufficient amperage (the full rated 1000mA constantly) to successfully charge more power hungry devices such as an iPhone (tested with the 4th gen), iPad (tested with the 2nd Gen), iPod Touch, ZuneHD and other smartphones (tested with the Samsung Omnia 7, which is quite picky), as well as all kinds of other devices.
The only problem with the unit is that the connectors between the adapters and the main unit are quite poorly designed. I had a bit of a problem getting the adapters onto the unit at first (because the little metal connectors which also act as a guide for the adapter were bent up to the point where it wouldn't really fit). Furthermore, these metal parts seem to slowly bend after repeated changing of the adapters, to the point where they no longer connect with the flimsy little metal connector inside the adapter itself (which I would deem of relatively poor design themselves, after opening one of them up). It is now exactly 3 months later and used on 3 different sockets and the adapter fails to charge.
As another user said, it may be better and a safer bet to buy an adapter which doesn't have changing bits and pieces and use a travel adapter.