I've got one on a 40X I picked up a while back. It's got by far the best glass of any scope I have owned, including Leupolds, B&L, Nikon, Burris, etc. I also like the outside adjustments, when you move it you know it's going to move. Kind of bulky though, and at some point it's going on my 1885 Winchester since nothing else looks right on that rifle. Think I'll try a Sightron on the 40X, and see if it's all it's cracked up to be.