I can't say if it will work or help for PN, but for muscle pain/soft tissue and joint pain it did work great for me.
My chiro used it on my shoulder, foot, wrist, elbows low back...
I have some chronic RSI/TOS/myofascial pain, so at times various things flare up.

It is not a scam, LLLT (low level laser therapy) is real, but it may or may not work for certain conditions.