Bought the 3500W version for a project removing old 1960s concrete septic tanks. Ended up being 6.5 tons of concrete. I beat the absolute heck out of the hammer the entire time. Tried not to do it too much but I would leverage chunks with the bit and flex the tool. After a while it leaked a little oil from one of the big allen bolts, tightened them down a bit and it was good. This thing did the job and it’s still running fine afterwards. How would it hold up to long-term commercial use? It probably would, might take some maintenance. For home use it’s solid. I seriously beat the thing (not intentionally just that the project was nasty) and it held up just fine. Like the little sticker says, “Tough tools, half price.”