Property me the blade-sharpener risen since I work a lot with the circular saw, the cross-cut saw and table saw. All saw blades have a different diameter, besides that, I've gained for different materials leaves with different numbers of teeth. A good saw blade with 250 mm diameter costs more than the sharpener and so I had to get out the price of the device after a time sharpening again. The structure of the device is easy to do on the basis of well-illustrated instructions. The device offers all the controls that you need for the different blades (angle, distance, size, depth of immersion of the grinding wheel, thrust bearings, etc.). For a saw blade I need depending on the teeth number between 5 and 10 minutes, incl. Setting up the device. For best cutting results, I recommend the possibility of the device, the teeth offset at an angle to sharpen to exercise.