The machine is very powerful. Rocks are no problem,. The welded wheel assembly broke the second day. When I called the manufacturer, they said they wouldn't just mail me a new one that I had to bring the entire machine to an authorized dealer to use the warranty. This place was 35 min away and I still had to bring the very heavy machine there. All I needed was a new wheel attachment. Not a good policy for a 2 day old product.