I've had guitars that the bone was just too soft and wore very fast. Unless the manufacture or builder can affirm that the bone is consistent and hard, I usually change to Graphtec Tusq with the first string change (still, I only have one guitar that still has a bone nut and saddle). I have also found Tusq to be more consitent in volume across all strings to my ear. I guess I'm one of the few that will admit I like the Graphtec Tusq product.
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