Yes, I'm looking to sell my 560. I have really awful vision (-9.75R, -10.5L) and suffer from periodic blurriness. I thought the 560 would help but it turned out that I just needed a more accurate prescription for my shooting glasses. The 560 needs a short sight radius, so if you have a standard length barrel (26"-27") you'll be fine.
You'll need to open your rear iris -- I went from a 1.1 to a 1.5 -- as the Fresnel lens eat up some of the light. Many service rifle shooters in the U.S. using AR-15s and a 20" barrel found the 560 to really help but I don't think it's found as much favour with small or fullbore shooters.
But if you want to give it a try, make me a reasonable offer -- the worst I can do is pass.
Jason