I like the current-usa gamma UV. Built like a tank compared to the turbo twist, aqua medic ect (makes them seem downright flemsy) and comes with all the pvc fittings, L's, reducers, teflon tape ect you'll need to get it installed in whatever configuration (I made a skimmer output pipe with the extra pvc stuff). I dont know if it works any better or worse than the others but its by far the best built in its price range. there are better at a higher price range like the link posted above but its the best of the cheapies IMO.