Just received my new RS-1 head and like the fit and finish very much. I do have one suggestion regarding its use with the Nikon D800/16mm. This camera/lens combination is heavy enough that upper horizontal arm slips on the upper rail unless the rotator tightening knob is twisted exceedingly tight. The problem is the 20mm diameter washer underneath the knob. It is thin, slippery and has a stamping burr on the edge...making it difficult to bring enough pressure to bear on the upper rail. Substituting a thick 25mm diameter fender washer (McMaster-Carr 90313A107) solved the problem. I look forward to using this new rig.