I have a BabyLock & I understand it is made by the same manufacture as Simplicity. I broke the presser foot lever on mine & have not been able to find a replacement. BabyLock will not sell the part. You have to find a dealer & pay a service to change it out. I have tried, w/o any luck, buying this from any other company that has the same machine under another name. I think all blind hemmers are sensitive to operate. Getting the right depth stitch for the fabric & controlling the fabric as it goes through the machine. As far as a commercial going faster, I have trouble sewing straight with the home unit as fast as it goes. I have seen where they were used on craft show items & the results are far from GOOD, much less perfect. I feel that is the operator not the machine though. I used mine quite a bit then changed jobs & wore uniforms 6 years & did very little garment construction. When I went back to it, all my skills were gone & I had to learn to master it all over. It was sitting on a table in my sewing room & someone backed a chair up & it touched it when they sat & the lever broke. If & when & find the part, I will have to learn all over again. If you do a lot of blind hems, they are good & fast but I really wish I had my $699 back. So much of what I now sew doesn't require blind hems so it has been an item that has not paid for it's keep. I purchased mine within weeks after they came on the market. I wore dress clothes to work & I used it a lot for me & my daughter's clothes. So much now is more casual with machine stitched hems or twin needle hems. When I broke it, I was doing lots of little girls smocked dresses with 4" blind stitched hems. I just today called another firm trying to locate the part. It is not a machine I would sell for lack of use. Styles come & go & I expect it's need will return someday.