I have the Leupold QR's on two rifles that I use for travel hunts, and I think they are great. You can mount a scope pretty low as well. I mounted my Leica ER with the low rings and that scope has a 42mm objective lens and it was to low for bolt handle clearance so I bought the med height rings and they were fine. I also like the small, low profile levers on the QR set-up for less chance of catching on clothing or back packs.
