I received my BioMax 600 on Jan 18th, 2022 and started using it the next day. I have been using it twice a day, every day for one and a half months. with my experience, I can confidently say Platinum-Therapy-lights is good. For muscle injury ( I have on my right arm), I only need 3-4 sessions (15 minutes/session) to get a full recovery. I have rheumatoid arthritis on my hands. Every winter, I feel more pain and cold to touch in the figure joints. Since I used red light, my hands are warm all day and the pain was dramatically reduced. I had a fracture on my wrist many years ago. Before using the red light therapy, I did not feel pain but just stiffness and could not handle the weight. I used red light, after the first 2 sessions, I felt the wrist was sour and a little dull pain at the injury site. After 5 sessions, the sourness was gone and I can lift the weight as usual. It was amazing! I'm a quite active person but getting old. Some pain comes out from the "closet" for no apparent cause, like sciatic nerve pain. The effectiveness of the red light is limited on the never pain, so far. I still feel pain but a little bit better. Hopefully, through a much longer time treatment, it may get much better. Overall, I'm happy with my purchase. I regret that I didn't get the BioMax900. BioMax600 is narrower than BioMax 900. So, for some treatment, I have to do one site and then another site. If using BioMax900, it will save treatment time. Folks, you can use Flex Spending Account (FSA) to purchase the red light panels. There is no downside to it. Though it is kind of heavy (22 pounds for BioMax 600), I cannot handle it by myself.