The GeoRipper Hand Held Trencher - not good for rocky soil.

GeoRippper Trencher Rental - Applications: Residential lawn sprinkler systems - Electronic dog fencing - Low voltage wiring (TV, cable, satellite dish) - Plumbing and drainage lines - Landscape edging - Silt fencing - Root pruning

Is it easy to operate?
There is a learning curve to operating a GeoRipper. This doesn't mean it is hard to operate right out of the box, but it does mean that you have to get used to it. The hardest thing to get used to is not over-throttling the machine. The GeoRipper works best at 1/2 to 3/4 throttle. Once you are used to handling GeoRipper, running at less throttle is easier.