Judy, I have the Brother SQ9185 and I love it. I've been sewing daily since early last fall and have not had one problem come up. I've sewn with very fine fabric for doll clothes all the way to quilting with a serpentine stitch on a quilt top sandwiched with a poly batt and backed with fleece. Nothing bothers this machine. It just keeps on sewing!
If you do decide to buy one, get the Brother bobbins while you are there. They are just a smidge taller than other bobbins.