Nickel, but two grievance.

This is a great device, which works fine. Certainly, it is noisy, the helmet is mandatory, but it is the principle that makes this sound difficult to do otherwise. I, who uses a pneumatic model at work, there's worse!

So it's a great device, but you're on your own. No mode of employment that explains how to do, and how to perform the settings! A peak.
Second complaint, the cable is far from flexible. A HO7 cable would have been nice!

Otherwise, a great device that is taken well in hand.