I am using this to open up cracks in concrete driveway for patching and resurfacing. Not bad. However it did not come with manual. Was searching web to see how to use a similar tool. Useful tips plus I found out I had to add oil. Nothing about adding oil came with product.
I was in the construction industry for 12 years, this has a metal casing and works as good as any I've ever used. Would be nice if they would recommend what oil to use, most people wouldn't know.
Much less expensive than the heavier rental units. Worked great for breaking up concrete, hard pan soil, cutting through tree roots, and even split some wood. The 2200W works well with heavey duty (12 AWG) extention cord.
Chase K. 
