Overall, the chair is ok. It is smaller than most chairs and not as comfortable as I thought it would be. The first chair sent had missing parts and had already been assembled and taken apart. Customer support was awesome and sent a replacement right away, they were very apologetic. There were no instructions about the vibrating mechanism, how it worked and did not come with a power source (battery, etc). It did come with a USB cable but no charger and the cable is not very long.