I've got some (several thousand yards) of Harro's original Spectra backing (Bionic Braid) on several fly reels that are now almost a decade old. The pink is bleached out and the backing has seen heavy saltwater use in hot weather on 12-17 wt rods. It's still all good, as I test it every season. Loads of tuna in the 50-75 class, mucho schoolies below that, and a few larger (+ several hours on BIG fish I never got to color

, + wahoo, pacific sails and dodos. It still tests well!!