To a lot of G&L tone gurus, the S-500 is unique and incredible because of the wood the body is made of, mahogany. There were ones made with swamp ash, but people seem to prefer the tone of the mahogany on the G&L Forum. I know that's what my Skyhawk has and I've been very pleased with it (as far as I know it's the only guitar other than the S-500 that has a mahogany body).