Extremely stable and at 450 rotations the torque is unbelievable due to the automatic gearbox. It cuts iron like paper. The only observation could be that it could have a laser for easy alignment, which I easily added by taking power from the existing 3.8 volt lighting power supply that matched perfectly with the Stavros laser I bought for 3 € and placed it above the lighting switch, which I replaced with a double one for separate control of the lighting and the laser.