It took some messing around to get this machine to work correctly. It is OK for up to about 4 layers of fabric (Sunbrella) after that the clutch ring slips on the balance wheel. Following the instructions allows the friction to be increased but it still isn't enough. Having also owned a Sailrite, this machine is close but not quite. On the Sailrite, i was able to sew through 8 or 10 layers of fabric if I was careful. I would recommend the manufacturer change the balance wheel and clutch ring arrangement to allow for more punch without slipping. Once this is fixed, I think this can be a very good machine for heavy weight stitching. Also, the machine came with US 120 plug, even though it was shipped to HK and description says it comes with 220.