I like this mask and it works well but I share others’ issues with it being really heavy. I fixed this with a slight modification - added another elastic strap with the thinner elastic (leftover from making masks in 2020). The thicker strap that came with the mask is now used a support strap across the top of my head, which keeps it from sagging. The thinner elastic goes behind my head and holds it against my face without smashing it too tightly and causing pain.

Great device, easy to adjust intensity, seems this is more powerful than another red light I had.

Downside - it is heavy, does not have battery so not so easy to use as the one with battery.

I bought this 4 years ago. It works, but I have to say it's a heavy piece on my face and not comfortable. For me to feel comfortable with it I either hold it up from the bottom if I am sitting down or push it up slightly off my face if I am laying down. The weight of it might need to be reconfigured. The elastic strap is not enough to maintain the weight of the mask firmly on your face it slides down so it needs to be changed into something that can withstand the weight of the mask as well for a more comfortable fit.

Stopped working after less than 3 years, poorly made and not worth it at all for the price.

- The hardware used (the control panel) looks like something made by high school students for their technology course.

- The fact that it constantly has to be plugged in is a pain and forces you to stay in one spot

- The design is poor: I have marks around my nose and eyes after the session, the elastic band is way too high thus creating an angle (so it's uncomfortable to wear + the lower part is far away from my chin)

This would be fine for a decent price, but for 500€, I expect a top-notch product and that is not it.