I've got the one for the pdc. The bits are exchangeable, it comes with 2, the PH2 for drywallscrews, and a small socket, I don't know for what application that one is used.
I haven't used it much, I ordered it as soon as it became available, but when it arrived my pdc was in for repair, I tried it on a makita drill with the centrotec-adapter, but it made the drill very long, and it also fell, which resulted in the depth stop chuck having a wobble. By the time I got my pdc back I already had the DWC collated screwgun,which came with it's own extra depth stop attachment.