I had been using Elixer strings on my Taylor 555 12-string since I bought the guitar two years ago. This time around, when I changed strings I tried a set of these Martins as I have the same brand on my 6-string Taylor GS-8. In a word, WOW! Love the sound these produce. They're a bit richer and warmer than the Elixers. I don't see these as lasting any longer than the Elixers and I play quite a bit. I will continue using these strings in the future.