Ask an expert. I have a very bad back, and several years ago I was moving and needed to buy a new mattress. There are so many mattress commercials on tv and I asked my chiropractor if any of them was better than others. And he said no. Might as well go with a regular mattress. I would check with your doctor or chiropractor or someone who knows about things like this before making a decision. $500 to $600 sounds outrageous for a chair. For that amount of money it would have to give me periodic massages.