I have the 830. Lots of posts and threads about it if you search. My machine has had numerous parts replaced and problems. It currently has another sensor in it that's bad and needs replacing. I think that makes 7 sensors replaced in under 2 years. It's at the shop more than it's in my sewing room. Luckily I own a hoard of vintage machines that happily take its place and never break down on me. If I could do it again, I would save a few more $ and buy an Innova.