I've tried the machine on a number of projects, but when it came down to doing a commission to re upholster 4 chairs, it failed. The material was vinyl and it could handle the seams, but when it came to the top stitching the stitches were inconsistent. The needle would vibrate wildly at the extra layer and catch in loops on yhe bottom, as I tried to remove the knots at the bobbin, it took off on it's own sewing without touching the foot. I'm lucky it didn't sew through my finger. The customer was not pleased with the finish on the tops stitching. I removed it several times & re-sewed it costing lots of extra time. I may not get paid for all that work because of this. Yes, I adjusted the tension & ran a test on scrap vinyl. I was sent home with 2 of the chairs to re-do again. I'm very disappointed with this machine.