Personally I am a big fan of them Scotty. Dug some history up for ya....sorry its so long but it needed to be

Credit for the invention of the surf leash is usually given to Santa Cruz's Pat O'Neill, son of wetsuit kingpin Jack O'Neill, who in 1970 fastened a length of surgical tubing to the nose of his board with a suction cup, and looped the other end to his wrist. Aside from the leash keeping the board nearby after a wipeout, it was initially thought that the surfer could use the new handheld product to leverage turns and cutbacks; by late 1971, however, the leash was much more sensibly connected to the ankle and the board's tail section (as the Frenchman Hennebutte had done years earlier), and was being sold???first by Control Products and Block Enterprises, both from Southern California, then by dozens of companies world- wide???simply as a board saver. Advertised as safe, the prototype rubber versions were in fact dangerous: Jack O'Neill permanently lost the sight in his left eye in 1971, after his leashed board snapped back and hit his face. Surfers by the thousands were meanwhile making their own leashes from lengths of marine surplus bungee cord.
"To Leash or Not to Leash, That is the Question" was the title of a 1972 Surfing magazine article, and for two or three years the question divided the surf world. Purists correctly noted that leashes encouraged less-skilled riders to try spots they would have otherwise avoided (board-damaging rocky breaks in particular), and that by removing the swim time from the surfing experience, lineups were more crowded than ever. Also, by relying on their leashes, surfers in general were becoming less water-savvy. "Leashes are for dogs" was the unofficial motto of the no-leash group. Leash advocates said it was more fun to surf than swim, and that leashes promoted a freer, more progressive brand of surfing. By 1975 the pro-leash group had won the debate (although it was a few more years before leashes would be used in large waves), and by 1980 it was rare to find a surfer not using a leash.
Leash construction and reliability improved steadily through the years, most significantly in 1975 with the introduction of the Control Products Power Cord, which threaded eight feet of nylon cord inside six feet of rubber tubing and thus limited the amount of tensile stretch; and in 1978, when urethane became the primary material.