I've tried it.
You wash your hair and condition as usual then you apply the glaze throughout your hair (be careful not to get it on your shower surfaces, it stains) then leave it in for 3 minutes and rinse.
I've noticed a difference in my hair. It's shiny and the color is richer. However, if you have oily or thin hair I do not recommend it. My hair gets oiler with this and I have to blow dry my hair almost immediately after getting out of the shower to add extra volume as the glaze seems to weigh down my hair.
Overall I think it's an OK product. Not sure if it's worth the price though (about $9) since the bottle only lasts me about a week and a half (I have very long hair). And like I said, I do not recommend it for thin or really oily hair. I think it would work better if you applied less product on the roots.
Hope that helps!