erm ... i think the nut makes a minor difference compared to a change in pickups , body wood and neck wood.
but my experience with bone is that they seem to give a slightly clearer tone. and if well lubricated and slotted , will not grab the strings and cause tuning problems.
well, the thing is, my strat is currently shielded, changed one pot, changed 2 pups, changed to graphtech saddles, and now changed nut (cos it broke.) i can't recall the original tone at all! :lol:
from what i read, nut material may not make such a big difference, but the worksmanship can affect the guitar extremely significantly.
a bit of what i experienced: clearer, a little more sustain, a bit more chime for some reason.
i was deciding on tusq vs bone, and i decided on the latter because most acoustic players prefer (quality) bone from what i researched online. thought it'd be a bit more interesting.
I used to use a lot of bone nuts but I find tusq of equal quality now so use them more... hardly any dinstiction between tusq and bone nuts...plus tusq q ready cut and curved - easier to install