Most of the reviews I read on this product were from people with long, thick, course, and/or curly hair. Being a fine, straight(ish), and thin-haired woman, I thought it would be nice to add a review from that point of view. This is long, but I wanted to give as much detail as possible. Here we go.
A little background on my hair... Fine, thin, natural medium blonde, very dry ends, lots of breakage. My hair has been highlighted for over 10 years, but hadn't been highlighted for about 6 months before the treatment. When allowed to air-dry, my hair was completely unruly. Basically, I COULDN'T air-dry because it dried embarrassingly frizzy, poofy, and half-straight half-wavy. Not pretty. I flat ironed every day since I can remember. It was to the point that I couldn't style it without straightening. If it makes sense, it was so damaged by heat styling that it needed even more heat styling! Viscous cycle... Whole thing in a nutshell, it was frizzy, poofy, weightless (not in a good way), damaged, and uncontrollable no matter what styling products I used. So...
First, when deciding to have the Keratin Complex treatment done on my hair, my main concern was damage and breakage from the extremely high temperature of the flat iron, even though everyone says the treatment is good for your hair. The recommended temperature for fine hair is 410 degrees, with extra passes on the hair. My stylist ended up doing 9 passes or "taps" at the root, then about 6 down the rest of my hair. Watching it, I was scared to death my hair would just fall off. As of now, the day after the treatment, I have only seen a few split hairs. I can't say whether these were due to the treatment or were already there, but I'm leaning toward the treatment since I received a very good haircut after it was done. I can deal with that though, because my hair is completely silky, soft, and smooth. The entire process took 2 1/2 hours including a cut after, because there were two girls working on my hair due to a scheduling mistake. They had to get me out fast. The normal time is more like 3-3 1/2 hours.
Second, I was worried sick that I would pay for this expensive treatment and somehow mess it up. (My salon charged me $350 which included the Keratin Complex shampoo and the vanilla bean deep conditioner) There is a long list of rules to follow afterward. I was afraid of sleeping on it and ending up with a horrible kink in it. Didn't happen. It stayed stick straight. I pulled it back with a silk scarf to wash my face, so it stayed dry. I put it behind my ears a couple times by habit today and when I realized it and took it out from behind my ear, it was still stick straight. (I'm writing this review on the second day after the treatment.)
So, my verdict: So far, this was SO worth the money. I was desperate, at the end of my rope, and ready to just shave my head and start again. (Ok maybe not) But seriously, I had no clue what else to try. I've probably spent three times the money in the last couple months on shampoos and conditioners, styling products, deep conditioners, at-home treatments, etc, than I did yesterday for a 4-5 month solution to my problems. I even broke down and tried both the Kerastase Nutritive and Resistance lines, to no avail. So, in my case, I'm actually saving money by paying for this expensive "hair thing" as my husband calls it lol! My hair is as smooth as a baby's hair, bouncy, and finally has that "weight" to it that healthy hair has... What I mean by "weight" is the weight that allows each individual strand to swing back and forth when I turn my head, instead of the whole mop just moving together in one ugly motion. I have never had that before! It is as sleek as a model on a hair commercial and shines like glass. I couldn't be more impressed. Side note: I do have a few Alfalfa sprigs on the top of my head. They are hairs that were broken before that I am used to struggling with in the form of kinky flyaways. Now they are totally straight, but stick due North! Ha! My stylist said they would calm down after my first wash.
I will post an update after my first wash and include pictures. I plan to wash and just blow dry. I'm actually hoping to get a little volume back after washing. When I say my hair is straight, I mean STRAIGHT. And it looks very thin, but what do you expect when you straighten the beegees out of already thin hair? In the meantime, take a look at the before and after pics on my profile. Hope this helps someone out there to make a decision.
UPDATE: After my first wash, I was able to simply blow dry my hair with a regular vent brush and it was perfectly smooth and straight. I could not be more impressed. However, I'm noticing more and more split ends and breaking hairs... I am attributing this to the flat iron temp on my fine and fragile hair. I hope this stops soon. I'm using the Copolla vanilla bean deep conditioner and Marrakesh oil, and hoping that will help. I have now washed my hair twice, and the results are the same as the first wash. I am very happy. I removed one lipstick for the fact that my hair is breaking and splitting. Hopefully this does not become a major problem!