When I took my 17 year old SCGC D cutaway to Steve Swan, he was knocked out by the overtones it produced with its Sitka top and BRW sides and 4 piece back. I have heard many other BRW guitars from that period and the are not impressive. Steve felt that the light construction techniques had more to do with the tone than any other factors. In conversations with Stefan Sobell, his "unsupportable theories" have led him to make heavier, not lighter guitars. I have played some terrific Collings guitars that are heavier than any SCGC, but the sweetest Collings I ever heard was an Advanced Jumbo in BRW. On that same day at Mandolin Brothers, I played an SCGC all koa 000 that was astounding. It still seems to be hit or miss from guitar to guitar.