Small Pool Distance Swim Solution?

I've got an uncle in-law who used to swim laps in his back-yard pool. It was bigger than most back yard pools, but still much smaller than I'd ever want to try to swim laps in. Still, he got by and swore by it. I think I'd swear too. Anyhoo, today I stumbled across this post (pics too!) which describes a rather cool tether which you can attach to the edge of a pool (of any size), and attach to your waist. Off you go ... well about two feet. I haven't quite figured out how this works with gliding - I guess you hit the wall behind you? I want to try one! Will give a fair critique if anyone wants to send me one to test. Send me a comment to arrange.