I grinded for 4 hours with small smoke breaks, everything is fine on a large eccentricity. Only in the "Turbo" mode, vibration is already felt and it is better to hold the handles. I used to grind on PShMahs, my hands began to go numb after 20 minutes. Has pros: Quality made! Long soft cord. Very low vibration! Three grinding modes! Velcro holds very well! Cons below: So far, I have not found any shortcomings, except for a little zamorochnogo switching Eccentricity!