I have fine, thin hair that is very prone to breakage, not colored, and it's to my shoulders.
I have been using this for about 3 weeks now. I used it every day, on wet hair when I washed my hair and on dry hair if I didn't. I used it according to package directions. It even feels nice when I'm rubbing it on my scalp, and doesn't take long at all. I didn't think I was going to like it because I didn't notice anything different with my hair for the first 2 weeks. It certainly didn't do anything as a "styling" product, but I don't think that's what it was meant to be. However, after about 2 weeks of using this I have noticed that my hair is fuller and has more bounce and volume. I actually have more hair (maybe because it's not breaking) and it has made it shinier! I don't need to use as much of my styling products. Oh, and I am not using the shampoo and conditioner.. just the thickening treatment. I am definitely going to keep using this. It's worth the price to me.
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