Pfaff's IDT is a true, stand alone, no screwdriver needed, built in, permanent, dual feed system.

Some other brands may have a piece of their dual feed on the machine, but you still have to add other pieces to use it, then remove those pieces and put the original pieces back on when you don't want to use it.

When Pfaff's patent expired, Bernina started adding IDT to their newest machines.

It is just super easy and convenient to never need a screwdriver to engage/disengage dual feed. It takes less than a second to do it. And with Pfaff most of their feet can be used with IDT engaged.