What is the opinion of Reddit about the
SNAILAX Vibration Massage Seat Cushion with Heat 6 Vibrating Motors and 2 Heat Levels, Back Massager, Massage Chair Pad for Home Office use?

They come in many different variations but basically something like this-

SNAILAX Vibration Massage Seat Cushion with Heat 6 Vibrating Motors and 2 Heat Levels, Back Massager, Massage Chair Pad for Home Office use https://www.amazon.com/dp/B0798LJDV3/ref=cm_sw_r_cp_api_fabt1_CNuUFb978J1NQ