I bought some of these a few years ago but did nothing with them till last week. You can adjust the width of binding up to 1", but you do need to use the bias binding with both edges folded over - the gadget won't do that for you. I had issues with the metal part in front of the needle pushing the top binding aside and only stitching the bottom on - then realized that metal bit was bent down, not flat. (It may be good for sewing stitch-in-the-ditch if binding is attached to the front first. Just a thought)
Have since found the others but haven't tried them out - they don't have that bent part either, so I don't expect any problems. The corners might take a bit of manouvering though.