I haven't used the Nikon's PC-E lenses, but use Canon's TS-E 24 II extensively. Concerning small knobs and sloppy fit, I guess this is a general problem with 35mm tilt-shift lenses. If you compare to an Arca Swiss large format camera with geared movements, the tilt-shift knobs on the 35mm systems is really crappy and poor feel etc.
However, having used the TS-E 24 I'd say that for actual results there's no problem. Despite the smallness and sloppiness it is good enough to consistently focus/tilt/shift well. All it takes is a good live view. On the Canon, the tilt needs locking down to not come out of position (one hand on the geared adjustment knob, one hand on the locking knob, and the eye on zoomed in live view), but the shift I often use unlocked.