Wonderful product especially for the elderly, and for vision impaired. This has an antireflux valve to prevent backwards flow of the urine. Bags on the leg or below make it unsafe with long tubing to trip on; and difficult to bend down maneuver to empty, etc. One reason it doesn't get a 5 star is the plastic seems to be "cheaper, or inferior". The seams can develop pinpoint leaks after a week or two; not with every bag, but with several we've used. I also would like to see a flip-valve to empty, instead of the screw to open and close.