For scalp stimulation, laser helmets are good. For lots of growth, if any, probably not.
I use one. Have been for the past 3 years. I find it's helping me keep what I have. No regrowth that I can see. It's proven that lasers stimulate blood flow. There is a science behind it.
They are also used for sports injuries to speed up healing.
They can be pricey, so only buy if you're sure about it. I bought one out of desparation. The only reason I use it is because I still have it. If it exploded, I'd be fine.
My hair "seems" thicker after using it. But as you will see around here, there are a lot of nay sayers.
Don't buy the comb. There is not enough power in those.
I'm not doing the unknown chemical thing that everybody else is doing. I would rather not f*** with my hormones and rub some sh*t on my head everyday that makes my scalp flare up. Just do some research. There is a lot of info. Just don't think it's a miracle cure that will grow hair. Because it's not.
I would probably skip out on buying one. I would be more interested now in checking out the Pilox if I were going to go for a device.
I only use it for scalp health.