My only experience with the Durametric people was a very professional one.
The first time (and only one) I called them was to order their Professional unit, and they talked me out of it.., saying that most likely the Enthusiast unit was all that I would need, and if for some reason I decided to buy their Professional unit, I could return the one I bought and pay the difference for the Professional one.
It made me feel very comfortable with their attitude and so far I am happy the way the Enthusiast unit has help me out, IMHO if you a DYI is a must have tool