All I use are Nikon Force XR's. My only complaints are that they're a little bulky on smaller revolvers and the eye relief changes noticeably when you adjust the power of the variable model, but other than that they're awesome, simply awesome scopes. I haven't yet knocked one off zero, no matter how heavy the gun kicks, and they even hold up well to me accidentally bumping them against things.
"We are only as strong as we are united, as weak as we are divided." - J.K. Rowling