Love my 6600. My one complaint about my Jem which was the first model on the market, is that stitch length is limited to short, medium and long. The short stitch is a bit too tight for piecing and the medium is a bit too long. Sometimes the last stitch or two comes loose when handled for piecing. I understand that in subsequent models this problm was resolved with the type of stitch length adjustment I had on my 1959 Featherweight. That was my only machine for many years until it migrated to California with my daughter.