I have a 7550 and a 2144. I love both machines and use them both. The 7550 is a real workhorse. it stitches beautifully and the embroidery stitches are perfect. As far as maintainence, all I have ever done is regular tune ups by my dealer. I used the 7550 when I worked for a bridal shop so it earned it's keep and I am still using it. Pfaff builds great machines.