Bought it together with a load of other USB cards as part of an evaluation process.
Wasn't happy with the support from Bert at the time, don't know if it's changed and also my take on it was people wanted Mach as the front end for support and knowing where they were.

One example was homing, at the time when you went to home from somewhere in the job it moved X,Y, and Z all at the same time. If you were in a pocket the result was to smashed the tool into the side as it was moving.
We had hells own trying to explain the Bert it needed to move Z first then X and Y.

He did alter it but it was the process of getting it done that switched me off it.