1) Who is the real producer.
2) Country of production
3) Price variation
4) Durability- world most durable massage chair is Fujiiryoki Medical- 100% made in Japan
5) Recline angle- world best recline angle is Fujiiyroki Medical 180 degreen( similar like sitting in bed) this is a position more than zero gravity
6) Relaxation programs (New masssage chairs come with gadgets that have noting to do with relaxation tehniques).