OUTSTANDING CHAIR!!! very heavy duty, well manufactured,  extremely comfortable and super easy to assemble... it took my son-in-law 15 minutes to do. There was a very easy set of instructions included. The vibration is exceptional,  and the heated seat is heavenly! I strongly suggest anyone looking for a dream chair to buy this one. Wayfair delivered it within a week, too! This time of year was amazing to get it so quickly!!!