I bought one and use it a lot. Works best if your water pressure is 40lbs or more. When I first used it my pressure was 80 lbs and it worked fantastic but my pressure is now 40 lbs and its still good but not as good as it was.
At first I thought it looked like a dumb gimmick,but reading the reviews on the Amazon site,that Infadel posted,I think I'm gonna buy one! Just the 'gimmick' I need for cleaning the cast wheels on my bike,my car,and my truck!
Thanks for posting this.