I just got a new pair of Talleys today. I went with the Quick Detachable rings in screw lock. Talk about a work of machining art. I can say with confidence they are the most precisely machined rings I have ever seen.
The moment I slipped them around my scope, (remember they are verticle split rings), they matched the scope tube so perfectly they didn't even require the screws to be installed to hold themselves around the scope tube.
I will post some pics when I mount them...