These things are okay. They sound and feel great when I first put them on. Been using them for a few years now. I've broken my E string tuning with my tremolo a few times, and they seem to go dead after about a few weeks to a month of constant playing. These are definitely better than the Cobalts, which rusted for me within a few days, but I may end up trying some D'Addarios, on my Ernie Ball MusicMan guitar, in the future.