One or two of the seven may "jump" fast when tuning down, but that is not a problem, because of the extent of "jumping" being small and since the tuning up/tightening is flawless.
Two facts make the product easier to use than conventional pegs:
a) The obvious, the micro-tuning provided.
b) The fact that the part that intrudes to the hole is not moving. Therefore, even if there is an anomaly on the hole (that was not smoothened during the reaming), that won't cause stability of the beg to suffer and tuning to fail. (Contrary to the conventional pegs loosing the tuning due to the twist, when the surface of them and the holes' are not sufficiently fitting/supporting each other.)
Note: It is probable that a user/player fitting the pegs will need a reamer of 1:30 tapper.