Got this for my mom to use when she would come over.   Nice looking chair and is wider than the one we bought my mom for her home.  There are two steel balls that sit near the surface of the chair about mid thigh.  If you pull your feet up and sit on them you may be uncomfortable but when sitting with legs out I don't feel them.  The heat is very localized in a small patch on the lower back area so don't expect a large heated area, also, the massage is not a massage, just a vibration. I notice if I use a blanket to cover myself the material of the chair will snag little bits of the blanket that I have to regularly brush off.  Best to have another person with you to help put it together in an easier fashion.  I'm a small/short, early 50's aged lady, and getting the tracks to go in smoothly to assemble was a little challenging but I was able to do it.