Having worked with AI to find the best product for red light / NR therapy, with warranty, available in UK and read the reviews, i settled on this. My family have complex health problems and this seems to be an excellent help. We are now saving up for a bigger one. It is well built and delivery was super quick. The only warning is to gradually build up use, especially if you have a central nervous system issue as it can cause adrenaline surges if you get carried away and increase use too quickly. We are very happy with the product.