I bought the drill hole in the ground in order to set about 80 fence posts for a double-wire panels fence in concrete. The total very well. Smaller stones cause any problems. Of course you can not expect to get so dig boulders or can cut through arm-width Wurzen. But the device is not built. In average soils of ELB does uncomplainingly his service and is extremely easy to handle. He jumps slightly and needs very little fuel. After two, three holes have to "bow out" and even deep holes with 200 mm drill are in less than 30 sec. finished. Have a good piece on it already often awarded (fence or planting holes for a hedge) and also other only positive feedback received.