I've tried gluing, too and Steam-a-Seam tape, but the edge just isn't consistent. When it's wandering around "in the vicinity" of the edge of the binding, it's very noticeable, even if the thread matches the binding.
I can understand how the Zip Bind system works, I just need to practice with it. If it works well, it will be a much more secure method of binding and if you make a lot of quilts for Project Linus or other comfort quilt projects, this thing will be amazing for productivity. :)
I bought a foot for sewing binding and it works beautifully on items that have curved corners - you cannot stop in the corner and re-position because the binding is locked in a fold inside the foot. You have to put curves on the corners and sew right around them. (this means that the binding must be cut on the bias)
It only took a little bit of practice to get that foot working well for me, but I don't want to have to put curves on everything - and the foot also won't handle a quilt with a medium or high loft thickness. It works fine for edging low loft quilts or two layers of fabric, such as you might use for a reversible apron.