I haven't had any experience per se with one. I spoke with the reps at the SHOT Show and have considered using one myself. Every thing I have heard of them is good. They add less than an ounce of weight to your gun and are incorporated in the guide rod of the gun.
If anyone has had any experience with them I would like to hear about it as well.
If anyone has had any experience with them I would like to hear about it as well.