brake lines.

Just got this 74 dart swinger. Gentleman who owned it before me has just recently put new brakes on all for corners. That is quite obvious. My problem/question is that he put on nylon tubing, similar to what I've seen used on air shocks in the past, I've just never seen it used for brake lines. I'm not comfortable with this type of tubing. So I am considering putting braided steel lines through out. Is this worth the cost, or should I go with regular steel tubing or am I being too paranoid about the nylon lines?