I use this scope on the on a .270 wsm and have had no problems with it at all. I have made shots with the gun out to 1200(target) and have the longest shot on game was just over 940. I think it is a great buy, especially when you are only paying $450 for it. If you are looking for a cheap scope that will preform very well then this is a great scope.
I shoot one on a .25-06 and absolutely love it. I've only run mine out to 1/2 mile or so, and it works quite well. I do like the side focus offered on other models, but I'll live without it on a pure hunting rifle.