I have a JUKI DNU-1541. It's sewn everything I've tried so far, including stitching through 4 layers of leather. I did get rid of that damn clutch motor and replaced it with a servo motor, makes it a much more pleasant machine to use. Yep, same one I converted mine to. 6000SM. Nice! I suppose if you're buying a brand new one you'd have the choice of clutch or servo, but if you're looking at used machines most of them will still have a clutch motor on them.