I have been using the shiatsu massagers for years...I got mine in a decent price, This company has massage nodes you can choose for your own comfort and the heat therapy really helps with my lower back aches.. I'm not so young anymore.
Now when i tried hot tub, there is no comparison. Don't get me wrong, the massage chair does give a good deep massage, but compared the massage in a hot tub, whilst submerged in lovely hot water...try once. You will not disappoint.