i've noticed the difference between my original lines and my steel lines while charging down my favorite mountain roads... both exhibited some fade, but with the SS lines there was WAY less... whether this problem is better addressed by fluid with a higher boiling point or steel lines is arguable (both would be ideal), but there definitely is a difference between steel and rubber lines if you're consistently rough on your brakes. I have not noticed any difference in autocross events (mainly because I'm always done in 60 seconds anyway), but based on my experience on road courses, this would be a worthwhile upgrade for track days or road racing in addition to people who do lots of downhill "spirited driving" h: