Well I just bought the 50' python a week ago for my 55 gallon. It's the greatest innovation, along with floating algae magnets. Storage might be a problem, but I just bought a long wide and really low plastic container for it which I store under my bed. It's really handy if you have a glass top or a heavier tank lid to hold the gravel cleaner end in the tank so that you don't even have to tank it out of the water. There are also a few tricks to catch when used first couple of times, but after that, water changes can be done in under 5-10 minutes depending on how much you take out. Bought it for $80 canadian and it was a great investment!
Also, don't even think about trying to build your own, it'll cost a lot more(checked it out) and the tubing you buy will probably kink, unlike the pythons.
