I don't know of any we have sold the Alpha-Sew & alot of inmates like them & use them alot & they don't seem to have alot of problems.We also have found a way to prevent the topshaft from getting bent in shipment.It probably takes us a good hour or more to go through one & get it ready,there's alot of little things that need to be done &
if you get a machine from ebay that hasn't been gone over I'm sure you'd have some issues with it.
Bob