B and I have
Throttlemeisters on out STs.
They are really nice. The fricton point is adjustable depending on how hard of a "lock" you want. B has his really hard, ride without hand on the throtle at all. I prefer mine softer, need to rest hand on, but don't need to grip real hard. (now, pull your mind back out of the gutter.
)
They are much heavier than the stock bar ends so they dampen vibrations well.
Hope that helps. [moto]