The first Brother I got was great until suddenly it would sew backwards right in the middle of a seam! I got an exchange and it was great until suddenly it started picking up the bobbin thread twice and I had 3 strands of thread coming out of the needle hole. Now I have an upgrade and it is great but every once in a while it will do something crazy. Then it is fine. Who knows why. I love the Brother machines and just wish they would let you know that nothing should surprise you.