This combination device from scarifiers and fan does the job perfectly. The structure of the pre-assembled unit is quick and simple to follow the instructions. Noise levels during use is really very acceptable, some lawnmower is louder; the device can be used on weekends (Sundays) with a clear conscience. Since I had no experience yet with electric scarifiers, I once approached cautiously to the first stage. In the second race I then selected the middle stage and the result, I am very satisfied. Materials and workmanship are absolutely ok