Any owners of Bosch gdx 18v vec impact driver?

[No skills]

As the title really (assuming I got the model number right), has any one been using this brushless impact driver for a while and could give me some feedback on it?

I've read a couple of things saying that bit holders have to be a certain type to go in the front of the driver, other than that has anyone had any problems with them?

Cheers all