I have two acoustics, one Brazilian Rosewood, the other Mahogany, now strung with these. Both have superlative sound quality, noticeably enhanced by these strings. However be advised that the wound strings have a very coarse pitch, by which I mean the windings are of relatively thick wire with deep valleys between windings. Your fingers will notice the friction, especially if you do a lot of vertical position shifts. The nanoweb coating is thus VERY different from the polyweb which gives much less friction but also a lot less sound. I'm still deciding whether the increase in sound quality is worth it.