Over sell is why I usually read and learn as much as I can and buy online. Can't be oversold that way. I have two straight stitch only machines. I love them both and I only do straight stitching and FMQ. They both have 9" throats and I can quilt a queen or bigger quilt. My daughter has a straight stitch only machine with 9" harp, she loves it. All three of above machines were different prices and basically are the same.
Buy only a machine that has what you need now, later you can upgrade if you need more.