I still gave this 5 stars, as it does what it says on the tin, and I can't in all conscience knock a star off just because Apple have decided to change the spec of their new phones which use the USB charging pin instead of the firewire charging pin.
Unfortunately, despite the fact that you get the battery charging symbol and no warning that the charger is incompatible, you may find that this doesn't actually charge your iPhone, but instead drains the battery extremely quickly.
Best to stick to the iPod USB Charger supplied with your iPhone.