I've had the same set of Hi-Beams on my fretless Corvette for over a year now and they still sound good. I have kept them clean and alcohol soaked them a few times. I don't recall ever letting strings go this long before and on this bass in the past I would only change because it had been several months. I haven't been playing fretted bass much at all in the past few years so I can't really compare but it seems to stand to reason that frets kill strings faster. Does anybody else find this to be true?