Serpentinite should be fine to use (from what I've read) They cut it with a granite saw, so it is stronger than marble.
I believe it (like marble) is a bit more sensitive to acidic etching, so if it were mine, I would make sure to keep a long wearing sealer on it and be most careful of acidic food spills. And probably wipe up with just water.
Of course having the pattern it has, not much will visually mar the look, even under heavy use.
It is quite beautiful.
