This boot scrubber is built very well and strong. It works much better than other models with just 2 bottom brushes. I would have given it a 5 except the mounting bars were not welded level. I had to try and bend one of the bars to no avail. I was afraid to torque it much, didn't want to break the weld. I finally found a piece of 2"x10" that was warped a little and got it mounted "level". Hopefully not all of them are like this. Still worth the money and better than others I looked at.