Hello!
I have an X-Touch (and it should also concern all control surfaces, as the Faderport, I guess). The jog wheel is rarely useful, because its displacement value on screen is constant (1 bar at the time), whatever the zoom value of the song page. If my zoom is at maximum, the displacement value of the jog is much too quick, so it's useless, if my zoom is at min, the jog is much too slow for a pleasant displacement.