I have a Pfaff 7550 and 2144 models. Both have IDT and it is great. I also have a Pfaff serger. I have a wonderful dealer who always has great ideas and the newest things that Pfaff puts out. The only thing I have ever done to my machines is regular maintenance. My dealer also has Pfaff club. We go once a month and it is a great time to meet other seamstresses and quilters. They really speak my language. I got my first Pfaff 15 years ago and it has been the best machine I have ever had.