Well you play your Rainsongs . . . I'll stick to my Martins ;o)

I think a lot of the value for me, is visual - they LOOK beautiful as well as sounding so.

New materials probably CAN sound great (I mean, why not?). But you can keep them.

Each WOOD guitar is an individual, even for a Martin. No pair sound EXACTLY the same, nor even LOOK the same due to the differences in the wood - they may BE different, but therein lies the beauty of them. Each of us like nuances, we have to - we are human. So each will appeal to a different person.

The thought of a resin or grp or any other man-made guitar leaves me cold - but hey, someone will like them, and the best of luck.