I bought my OO-15m custom pretty much fresh from Martin via LA Guitar Sales. I noticed an improvement after a few days of playing it in, but that's the case with most any guitar. It sounds real good now but it sounded real good when new.
I've had a couple OM-15s and they didn't change much. I did put one of the OM-15s on a tonerite and it loosened it up a little.
I think an all mahogany guitar needs to sound pretty good from new to improve much over the years.
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