This is a very comfortable armchair.  I suffer from sciatica ando comfortable sitting is critical to me. This armchair allows you to adjust your sitting aggle, back support aggle, even your neck position, also your legs. Massage/vibration is very nice and relaxing. Don't expect too much heat.  Assembly is very easy. I am 80 and I set it together in about 20 minutes.  Now I use it several hours per day with great pleasure and satisfaction.