I cannot fault the design of this product. Looks well made and works reliably. Bought to remove concrete from brick and granite pieces. I assumed that higher BPM and shorter stroke would be good for penetrating concrete and mortar, but apparently I was wrong. It might not be fair to only give it three stars as it might be well suited to another task, but I'm disappointed. My $10 Port Cargo Pistol is more effective at removing material. I've found this one to work reasonably well on delicate surfaces that are easy to extrude. However, this is only a slight improvement over my other hammer, which runs at lower air pressure. in summary. Good design. Poor performance when removing heavy material.