This chair has been great for my husband who has a spinal chord injury and often suffers from extreme back pain.  The massage feature is more of a vibration like many have said, but it relaxes his muscles enough that he notices a reduction in pain.  The heat feature seems to only be prominent in the lower back area which does not help his issues, but he claims it is relaxing none the less.  You cannot use the heat feature without the massage, something I do find a bit frustrating but it isn't a deal breaker.  
Assembly was fairly simple.  The chair itself is lightweight and easily lifted or moved around the home.  We have not experienced any issues so far other than the material being a little bit squeaky but that is expected with faux leather.