Great question. I purchased my '68 GT500 for $3000 in 1977. It has been huge source of joy for 47 years. Every element has ben the very best money can buy. Including a brand new, unassembled, side oiler engine built by Roush in '79 to mirror the Lemans winning GT40. When it came time for a money-no-option, full restoration 20 years ago the brake line choice was clear, Classic Tube. The fit is perfect. Perhaps more important, both the nut and tube are stainless. No worries of a soft, carbon steel nut rotting in place on a either the master or wheel cylinders. The trick is, necessary to use nickel anti seize on both the treads and surfaces between the flare and nut. Or they will gall and prevent proper tightening. Just this summer, I took the car out of storage after 14 years. A full inspection found no flaws or leaks anywhere. Last Saturday, a douchebag cut me off in heavy traffic. The perfect brakes prevented a serious crash.