Sinar patented two completely different systems of yaw-free settings, one designed for the P-series, the other for the F series. Then other folks marketed yaw-free when their patents expired. This kind of control might be helpful in certain tabletop studio settings or for architectural photography when you're dealing with fairly consistent planes. ... But frankly, I don't pay any attention to it anymore, since I mainly encounter complex plane of focus issues in landscapes. And for architectural shots I generally level the camera first anyway. But I do use both axis-tilt and base-tilt cameras, or ones with both features, and it's just a matter of staying in practice with either. ... Having good equipment and being comfortable enough with it to operate spontaneously is far more important in my opinion than the general debate.