Hi, BJ! While I don't have the attachment, I have used it. It works well, but as with anything, it requires a little practice. It also works better if the binding fabric is starched. I know because I have tried it both ways. However, unlike the Martelli system, with Bernina there is no one system fits all. Unfortunately, you have to decide which size binding you want to make and purchase the system for that one size alone and it is quite expensive. I can't remember off-hand the size binding the three binder attachments do, but I can tell you that the smallest is good for binding garment seams (for example, an unlined summer jacket); the medium size will probably do placemats and the largest size is for quilts. Bernina updated the binder attachment last year so that it accommodates square corners (the previous iteration only did rounded corners). Corners will still turn out a little sloppy until you get good at it. Unless you're going to do a boat-load of machine bindings, it may not be worth the ramp-up time to cost ratio. I honestly don't remember the price, but if memory serves me correctly, I think it might have been in the neighborhood of $189.00 for one binder attachment, but I'm not sure. Multiply that by 3 if you do different size bindings and you have to purchase presser foot (I think) #94 or #95 to go with it. Hope this helps as a brief tour d'horizon.