Yes - thanks Pat, the carbon fiber is what I was referring to, and thanks for the detailed answer. Now since I confused gutitar hacker with my question and he asked if I mean " robo tuner pegs or the ones that work from the bridge with tension" - well - what about these 2 items. What are people's feelings about the need to invest in these 2 items.

I will say I HATE when my guitars go out of tune - and it happens way more to me than it should to somebody so serious about the study of guitar ha ha