I received my new Martin M610 Concert strings a couple days ago. I can report these are very nice strings and best described by 50% fluorocarbon 50% NylGut sound. They have the very nice playability of fluorocarbon and some of the punch, but also balanced out with the mellowness of NylGut Strings. I think these are going to be a hit. Also the gray string color looks nice.
However, I assume it's the first run, but there's a labeling mistake with the inner string envelopes. They have reversed the labels, so be cautious if you order some of the first run. I haven't tried the M605 or M615 strings to know if they are mislabeled, but the M610's are as seen below.
However, I assume it's the first run, but there's a labeling mistake with the inner string envelopes. They have reversed the labels, so be cautious if you order some of the first run. I haven't tried the M605 or M615 strings to know if they are mislabeled, but the M610's are as seen below.