I buy these strings for tone - not longevity. Once they settle in, I get a great bluegrass tone from my Sigma D38v. They do lose their initial brightness fairly quickly and some folks may feel that as a result, they don't have a very long useful life... The tone is great when they are in their window of operation though.
Good value strings that do the job but tarnish quickly. I've moved over to coated elixirs since and haven't looked back. Strings are very subjective, so all I can say is try them and see. They won't break the bank! Oh, also they seem to break way quicker than elixirs, but again, they're way cheaper.
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