Ok I got two sets of these medium gauge strings. I generally use Martin 92/8 phosphor bronze which are amazing strings, imo the best phosphor bronze because of the makeup. Back to these strings, I put one set on my Martin HD-28 (rosewood) and the other set on my Martin D-15 (mahogany) both excellent guitars. These strings do have a clearer less muffled sound than any string I have tried. Now I have other guitars comparable to those two, both woods and these strings are definitely clearer and a higher quality tone and steady ring to the note sustain. Very level compared to a circular sound which have volume up and downs. I do use medium gauge for the benefit of the volume and most of my guitars are built for/or set up for mediums. Ok this isn't a great loss of volume but the flip of the awesome tone is you lose a slight amount of volume which no one would ever notice but maybe you. Its not a lot of lost volume but maybe 8%. I haven't had them on long enough to comment on longevity life but they feel sturdy. I disagree with first reviewer who has the complex guitar, not sure what that meant, but these strings have the normal tension of standard medium gauge which is a great achievement of the maker considering its a different material. No adjustments are necessary, you will also find these strings very smooth, they don't scream and squeal when you slide your fingers down or up. All in all I consider these a premium grade string, and if they last will be worth the couple extra bucks.