For all the time of use, it was under repair 4 times and all for one reason - a problem with the reverse button. All the time there is something burning and charring. They do it for free, under warranty, but each time it takes about 2 weeks of time, + time to bring and pick up. The cartridge has a strong beating, you can’t work with long drills and drills. The power is small. Wood and gas blocks still all right. But bricks are already with difficulties (any, especially ceramic ones). I'm talking about concrete in principle. Tried it 1 time and gave up. Neither nerves nor forces are not enough. As well as equipment - it just burns. Complete discrepancy with the declared characteristics, prices and reality.