The Navi controller itself is very handy and you can reach all the buttons with ease. Certainly it is also possible with the DS3 controller, games like Resident Evil 5 to play, but only if you're right-handed. When the Move controller (the one with the flare), holding in his left hand you have a problem, because the to-use joystick is on the left grip controller and you just can not use this with the right hand. So the Navi controller for lefties is a must.
The controller makes a robust impression and is made of the same material as the DS3 controller gefertig. One therefore the product in the usual PS3 Quality.
When power supply Sony also pursued in this controller, the proven strategy with a built-in battery, which has indeed already proven in the previous PS3 controllers.
A negative point there are still:
There is no USB cable attached, this is certainly the fact that the new PS3s unfortunately have only 2 USB ports and these are already occupied by the normally existing cable from the DS3 controller and the camera cable.
I have therefore a USB port and two additional cable added myself, so that I can go more than one controller at a time.
All in all, the controller fulfills its service and therefore deserves 5 stars. The lack of USB cable leads again to half a star deduction, so 4.5 star left over at the end.