works pretty good, does not increase hair for me but ...
925828
been using Nioxin for years, works pretty good, does not increase hair for me but seems to have helped retain what I have.
3620364
My hair was starting to thin at my temples. I added this product to my haircare routine and the hair in that area looks thicker so I am convinced this did it's job! My scalp did look red after application, but it lasted about 10 mins and then you couldn't notice anything.
1513175
I was very skeptical when I purchased this product, wondering if it was more hype than substance, as with a lot of products sold over the net. But having used it for more than 3 months, I conclude the products works as claimed in the ads for it. In my experience, it does not completely prevent grey hairs, but it does blend them so good as to give the appearance of no grey hairs. Also I have not noticed any new grey hairs growing since I started using the product.  For me, that is enough to make me keep buying the product until I see something better.
2798901
It works pretty well, definitely better than any previous brush i've used.  I am not getting the giant clumps of hair that you'll see in some of the photo reviews, but I still get a fair amount when brushing the cat.  It's a good brush - not a miracle.

Make sure you apply at least a little pressure - you can almost feel the loose undercoat hairs being pulled to the surface.  Kind of like brushing through a knot.
4094505
It worked better than expected on my hair. It makes my curls shiny and takes off the frizziness of our South Florida weather. The only reason I give it 4 stars is because it gives me a little bit of dandruff but that might have to do more with my scalp than the product itself.
2244961
I love how light this is, with four pumps on quite long hair and only used on the ends and up a bit towards the crown it works well. If I use it on the scalp area of hair it does not make me any more oily but it does not control the frizz nor give any benefit. I don't know how well it is against heat because my hair was a bit dried out when I purchased this. I did find the living proof Perfect hair brand to be about the same so this would win in terms of price. Some days it really smoothed out my hair despite being consistent in my blowouts. I would repurchase for price but I have found some other products of similar quality to actually smooth more effectively. It smells nice and makes my hair feel soft.

When I use it on dry hair ends before straightening it works well? I still get many split ends and dry hair but overall i am skeptical of all 'Heat' products. I just figure its worth it to use it rather than not.
759025
I was not sure this would work since I have extremely thick curly hair, so here it goes.  It does work! I let my hair dry naturally, and used the Ionic hair brush.  It really did work but not as well as my flat iron.  The pros is that is great for touch ups and it is easy to use.  This will be my everyday straightening tool, but when I want pin straight hair, I will continue to use my flat iron.  The Cons is that my daughters have already taken it over and I may have to order another one for myself.
711118
Pretty cool, but doesn't trim quite short enough for my preference.  I thought I'd use it from time to time if I was in a hurry, but I usually just revert to my electric bikini trimmer.  I'm not sure why it comes with a shaving razor - I'd rather have the trimmer come by itself and have the package cost less.  But I would definitely recommend this over nothing!
3056709
For my fine, thin hair this does not provide anything special.  However, it does not leave my hair stiff.  I use it but I don't really love it.
3206877
I bought this item because of the comb attachment, which can be hard to find.  It works well but it doesn't close as tightly as my other one did.  It does get hot fast but I find that I have to go over the same piece of hair more than once.  I have straight hair that frizzes after blowdrying so I spray a little anti-frizz hair oil mist and straighten it afterwards.
For the price I believe it works well, neware it does NOT have auto-shutoff!  It doesnt claim to, but just so you know....
3091192
Works great, I only use a bit of product and my hair is extremely long, so a little bit goes far
3096160
This works great. I use it as my hair is growing out, so it doesn't get much use, but I really love the temperature, it doesn't burn my hair
2848481
This works pretty well, but be careful to take really small portions at a time or it will break hair.
1618293
Surprisingly, my cat tolerates this pretty well. I have a somewhat jumpy 3yo shorthair, and she allowed me to use this. She seemed to even like it on her lower back area. But then she would suddenly jump up and leave. It did remove a good amount of hair. I think with a calmer cat you could really remove a lot of hair. Lost a star because the fur ejector basically didn't do anything. So much easier to just pull it off and throw it in a trash bag.
Note: the cover for the the comb is in the bottom of the package. It's just a thin piece of neon yellow/green plastic folded over the instructions, and it's easy to miss and accidentally throw away with packaging.
2710003
So far so good, I read the tip is too small and people were burning their fingers this didn't happen to me BUT I did burn my cheek when I forgot to put the "stand" down (not sure why but it gets as hot as the iron does) and my iron came with a "heat booster button" yeah that dfoesnt work at all. I have the babyliss blow dryer, and flat iron both work GREAT. I cant put too much hair in the iron at one time doesnt curl well (I do have thick hair). But soo far so good it does get hot so I will keep with it and put less hair per curl.

***UPDATE***
So, 2nd time using it and the green light no longer comes on, its not as hot and my hair slips out of the barrell. VERY disappointing will be returning.
4139311
When I bought this I was 99% certain I was buying snake oil and wasting my money, but it does appear to have worked! I mainly bought this because I may or may not have ripped out a good chunk of my eyelashes by accident while pulling off a falsie and I was desperate for something that would help them grow back quickly. I no longer have a bald patch on my lash line and all of my lashes are a good deal longer, although I haven't noticed any significant increase in thickness except for where they had to grow back entirely.

I'll try to remember to update again when I've finished the tube to see if they continue to grow longer / thicker. Right now they're nice and I can vouch for the product, but I probably wouldn't drop another $40 if it doesn't grow them to falsie length.
92554
Works ok, not excited about it but not disappointed