well they will sound the same 100 years from now, which may be good or bad. i think the eq of each composite guitar is more scooped- not as many mids as a wood guitar. When you strum a chord, you tend to hear individual strings versus a unified tone. I love this, but some people don't. The bass has this piano-like resonance going on. Structurally, there is no heel, and the tops can be really thin and rarely requires bracing, so it is technically louder and clearer. Overall, it is a modern sound, but most acoustic guitarists want to sound more traditional. They also take processing better than wood guitars. I tend to go for more modern acoustic sounds (Al Dimeola, Adrian Legg, Kaki King) so Ive gone with a carbon fiber guitar.