I just got an SE Mira today, so far very impressed with it. I think the nut on this one claims to be graphite composite, versus "synthetic" on a SE Custom 24 for example. Not sure of the difference, and it's only been a few hours, but I'm fairly happy with the stable tuning so far, compared to the two (now one) Gibsons I own, that have poor nuts, rarely stay in tune. And they're more expensive. Got a new S2 too, and that also seems to stay in tune very well. Fingers crossed, but I don't see any need to change either so far. Time will tell.