I've only been playing it for an hour or so since i got it, but the spontaneous difference is that the 65 has more focused and clear bass and mids response,faster projection, where the rosewood has that thumping bass and lots of overtones and kind of a more sweet sound.
Anyone know how the value of the Rhode Island made Guilds like the JF-65-12 will be in the future? Will they increase much in value or just a small bit from what they are worth now?