If the reason that some of you are not using your guns is that the little tacks don't hold your quilts firmly enough, they might be the earlier versions that had thicker needles, and longer tacks. I had the same problem with my first gun, then hit on the idea of taking a stitch with the gun, so that the needle went from front to back, then returned to the front again before I shot the tack through. That certainly held everything firm, and had the bonus of producing a little plastic 'stitch' on the reverse that made snipping it easy at the end. I still prefer my micro stitch version now, and wouldn't be without it.