I use one on my .308, I'm really pleased with it. As mentioned, there are slightly quieter ones around but I have no problems using it when stalking. I have the overbarrel model which only adds 3 1/2 inches to the overall length of the rifle. I have heard that you are not supposed to strip it for cleaning but mine gets taken apart every time the rifle is fired. I got it from Swillington Shooting Supplies in Leeds and I think I paid around £200 for it. Incidentally, you can get up to two more modules for it from them for £25 each.