Funny, I've used rounds and flats (I prefer flats) and have never torn up frets on either bass or guitar. I am an old fart use TIJF's on basses and archtops. If you dig in they can sound pretty bright on bass. I've never ever had anyone ask what type strings I use on a gig. We are playing bass and its rare anyone gives a crap what we do. This ultimately works to our advantage.