I bought the Pfaff Passport 3 this summer to use for classes. My favourite feature is the IDT which makes it perfect for classes or retreats since you don't need to switch to your walking foot when you're at the quilting stage. It also helps keep your fabrics feeding evenly when you're piecing. I even find it handy to bring with me for other purposes. For example, I took it with me to my DM's to make button holes for her a jacket she had recently made.
I'm very happy I bought it as I've been enjoying it a great deal.