Well, I thought I "needed" one of these as I've been just using my walking foot for quilting the last 12 years. LOL. It was only like $12 but I was rather let down. It does help keep the stitching straighter, but without the walking foot function you have to basically pull the quilt through. Too much work and drag! And of course dragging it through the machine affects the stitch length. I don't know how you gals who use the stitch in the ditch foot for quilting can stand it:< I can see how it would be useful for bindings and that's about it. I'm back to using my walking foot and that's that! I would imagine using a Pfaff and the IDT would make using the SITDF much easier and useful.
Two thumbs down for the SITDF Janome 9000 type models, for quilting.