Yes I am sold on the commercial sharpeners they put on as perfect and true of angle as the factory (in some cases better). The thing that sold me during my research was the fact that due to the higher RPM of the commercial blade grinder over bench grinders it will pull the material off the blade quicker taking the heat with it thus keeping the blade cooler. The other plus to these sharpeners is the fact that once you the proper angle on the blade has been established it only takes a few passes over the blade to sharpen, many times hand grinding a person will go over it a number of times thus shortening the life of the blade.
P.S. when I am doing sharpening for others the 摘ye Appeal of that perfectly smooth edge sells itself, sometimes you have to try to slow down the walk in business considering this is an after work hobby.