I have the Singer 9240, one of the first Quantums made. The one made before the 2nd version of 9240. Only so many were made for the first version. I love it. I bought it before I started quilting as I was just sewing. The stitch is straight not angled like most of the decorative stitch machine. It has never given me on inkling of trouble, uses every type thread I have put on it. I found if I don't use Singer needles the auto thread won't work. The Singer needles are a tad different in length. I don't know about the later models but this one I have is an excellent machine. I have a Bernina, Brother, Janome and several vintage Singers and my Quantum has them all beat with perfect balanced stitches.