I have the vortex 2 inch cantilever mount on my mp10, also have the vortex viper 6-24x50ffp, they say from the factory that it doesnt need to be lapped but just to be sure i put the wheeler lapping rod in there anyway, what could it hurt? Well, turns out they were totally wrong, after 5 min of lapping i checked and there were barely any silver spots showing. it ended up taking so much to get at least 75 percent contact that it removed a lot of material, so much so that the top ring halves almost contact the bottom now, not good. I am really thinking about getting a burris pepr but have read some bad reviews about the qd arms binding up, but i am also seeing some great reviews on this thread about them, and the fact that it is on sale for 59 bucks right now at PSA makes it pretty enticing. Also, as far as the need to detach quickly, i didnt really see the need for it either, until i was deer hunting the other day and it started pouring the rain, my scope stayed constantly foggy and wet and i had to check it every 2 minutes to make sure it was ok, i then realized that if i had a quick detach mount that then would be the perfect time and scenario in which to utilize it. i never thought i would have the use for one....... until i needed it