I purchased these strings a couple times now and I'm still amazed how bright they sound and how long the brightnes and clearity of the sound stays. I have them on my Fender CD-60 CE and the everytime I put a new set of strings on my guitar, I have to readjust my in-ear monitoring sytem so that the high tones dö not clip.
As I mentioned before the duration of the strings is really nice not as long as the the Elexier Nano Web, but they last about 3 - 4 month with band practise 2-3 times a week and the daily playing around.
I love the Martin SP lifespan strings. The best quality of sound for acoustic strings that i found and ever played on. They sound best of course in the first 3-4 weeks of playing, but holding a preety good sound for a few month after. If I don't have a really importent show coming I wouldn't change them for few good months...
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