No, I don't have experience. For what it's worth, though, I did read an interview with the guy who developed it, and he said that the important thing was to pick the right person to do the fitting. He said he thought his system was the best around, but that simply putting the numbers into it would not automatically give the right answer. It would get the vast majority of people very close to the correct fit, but somebody knowledgeable still had to check it out with the individual customer and, probably, make the final tweaks to get it just right.