Thanks for the review Joe! Kirk makes some outstanding gear.
I have the RRS modal (the Kirk head was not out when I needed one) and like it a lot. I do like the smaller knob on the Kirk.
The clamp on the RRS head has the same limitation. You have to loosen the bolt in order to turn the clamp. I keep an allen wrench in the little zipper pocket of my Black Rapid Strap so that I almost always have one handy.