Engine and batteries are super. A lot of power and stamina, even in professional use. Two negative points I have: - As already mentioned by other customers, I think the case for such an expensive machine, a lesser impudence. The machine is flying around in it and has absolutely nothing to hold up. Sad ... - The other being the slip clutch. This is at the highest level too easy for such a strong screwdriver. I usually screw something stronger screws in drilling mode otherwise the clutch too quickly slips through. This is definitely in need of improvement.