I think if you were otherwise inclined to pay $22-$30 for genuine flex lines then the SS lines make a lot more sense.

Also FWIW the last regular rubber brake lines I bought lasted only about 4 years before hey cracked all to hell. Mind you they weren't genuine- I can't remember who I bought them from (AB Maybe?). Given my experience with those aftermarket flex lines I think I'd give SS flex lines a go next time I deal with lines.