Yes sir, I have very extensive experience with them and they are completely awesome.
Not one single complaint after several years of using them on several different rifles.
There is a small and simple trick to use with these in order to be able to swap a scope out on different rifles. First, all of the rifles must be the exact same model. Remington model 700, for instance. You start out with one rifle on which you mount the bases, then carefully mount the lower rings on the rifle bases and then attach the scope with the top ring halves. Do this in a very methodical, slow step by slow step manner, ensuring that there is nothing placed in a bind.
Now, when you mount a set of bases on another rifle on which you will use the same scope, you actually use the rings and scope configuration to "set" the bases, so to speak. Gradually tighten the bases to the rifle, making sure that the rings and scope will slip in and out of the bases as you go.
I am sure that this is likely explained in a better manner than I have done, as I simply learned this on my own by trial and error, but I promise you it works like a charm. Once you have the set up done, you can add scope and ring combinations by securing them to any rifle that the bases are already set up on.
Make sense? I hope I have been able to help you with this very functional QR set up from the good folks at Leupold.
Jeff