I thought I would try out the FlatTops as a compromise. I had been using Round Wounds for my acoustics and detested the squeek playing up and down the fretboard. Flatwounds work well for my archtops, but produce a muffled sound acoustics, so thought I would try these. And am I very glad that I did. The EFT16s hold sustain and produce a fantastic tone. Plenty of character, volume and clarity.