We needed to clean our large patio. We moved into the house last year and this hasn't been done in at least 5 years, so it was filthy. There was no way I was going to spend hours upon hours using a nozzle, so I researched and bought this instead. It still took time because of the large area and the degree of dirt, but wow. Attached photo is after 1 pass, I'm going to go over it again. Tips: A- I'm 5'4 and could use this comfortably, if you're any taller you'd probably want an extension piece. B- The most efficient way to use this was to pull it towards me while I stepped backwards. (your feet will get wet! wear proper footwear) C- It did tend to get 'stuck' at times (the spinning slowed/stopped). Cleaning with the supplied pick didn't always help, I found that manually taking off any debris accumulated from the center helped. And to check if the issue was resolved, I'd pick it up off the ground and turn it on until it span normally.
Was cleaning my drive with a three-nozzle non-moving wand that came with my machine. This rotating head was much faster and did a more consistent job. I overlapped each pass by 50% for the best cleaning.