Thank-you for telling us about this device. My wife has PN in her feet and tried using an infrared device, also from, where else, Amazon (aka the company store) and after using it for about a month she believed it was helping her. But after further use she began to believe it was more placebo effect than anything, and by about 2 months of use she gave it up completely. Here is what we got originally: https://smile.amazon.com/gp/product/B00IVPMZKE/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
What you are using is called Low level laser therapy and may be significantly different than what we used (and obviously much more $$$).
Anyway, after the first one disappointed, I got a 2nd device from Amazon, basically a glorified infrared light bulb, and I had to rig it up for her so it could be used easily. She used this one and at first was more pleased with it than the the original unit, but then after a while, just like the first one, she began to lose confidence that it was doing much for her. I should say, she was using each of the devices from 2 to 4 times per day, usually for about 15-20 minutes each time and used each light device for about 2 months altogether. Here is the link for 2nd device (bulb): https://smile.amazon.com/gp/product/B07JW9RZ7K/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
What you are using is much more expensive and might actually help, I sure hope so. I will be very interested to hear from you later as to how you feel about it after much more use. Thanks for posting this. Best, Hank