Nope never used them, never even seen them myself. I did once meet a lady on an advanced coaching course that swore by a certain nock which had an inner "grip" section inside the main nock, the theory was that somehow the acceleration of the arrow made the "grip" part let go of the string so you got a cleaner release. Both myself and the instructor at the time thought that there was more chance of inconsistency in these due to having moving plastic parts, than a nice reliable plastic easton or Beiter nock... Wish I could remember the name of them, seemed like a daft idea to me though...Hi mbaker74, bimble mentioned those and I'd buy a pack just to see what they do except the size compatible with ACEs and g nocks no longer seems to exist.
Have you ever used them? If so, any comments? The other forums seem very polarised about them though most of the posts are long enough ago that if they did increase spin rate dramatically on a recurve, and that in turn also improved arrow flight, they'd be everywhere (especially at 70m where stability in the wind without extra drag is valuable).
Back to turbonocks, I think that if they were actually proven to make any difference, the pros would use them to gain one or two points over a round, and the majority of pro shooters that I have looked at seem to favour Beiter nocks.....