After I had now already tormented me a long time with a hammer drill in walls, had finally produces a hammer. Encouraged by the good reviews and the good reputation of Metabo I bought this device from Amazon. It keeps this machine on the wall and already is the hole in the concrete, just awesome. The other machines can also, but what's so special about this Metabo? It is a high quality finish, the necessary weight has to be able to function effectively and is nevertheless still handy, it is in essential parts from die - cast aluminum, has two different quick-change chuck, providing you with the electronic speed setting, the forward / reverse operation and two - speed system make it a universal drill. Some of my chiselling this machine was also very ordenlich to work. The connection - rubber cable is the longest I've ever had at a drill. Only in the interior compartments of the suitcase itself Metabo could try harder. For example, the second, not just lightweight, chuck it thumps when carrying around always pointless. Who can be device register within four weeks after purchase Metabo who receives a XXL, ie 3 year warranty, from Metabo. I want to mention in conclusion that a perfect result also includes equally good for drilling. I use for concrete and stone, the SDS-plus drill RX4 from Milwaukee who is also here to buy from Amazon.