I love my Pfaff quilt expression 4.0 for the same reason. I used to sew on my grandmother's old Bernina. But when I visited my cousin I worked on her Pfaff and fell in love with several features - the IDT being one of them. It makes accurate sewing so much easier. And it can be used with many different sewing feet - that's a big advantage as well.
I also used the IDT to sew together and quilt my corduroy bed throw, sometimes it went a bit hard over the thick seams but it worked.