I only dropped one of the stars because, for some reason, the consistency of the full-size bottle seemed to be quite different from the lovely, light, quickly absorbing, and silky to the touch version I got as the sample, which felt like something revolutionary by comparison. Perhaps, since it was in such high demand and went out of stock when I tried to get it right away the next batch was rushed or mismanaged? ~shrug~
Nonetheless, the second version was still just about as good. The two best parts about it are the fact that it is UV protection and that it is crystal clear (as opposed to another product I reviewed recently which lacked these two qualities).
So, even though this was a bit on the sticky and thick side (more like a regular silicone gloss than a penetrating serum as the first was), I just had to experiment a few times to get my hair to the right level of dampness to thin it out well but still absorbs it and then rub the product in my palms instead of spraying directly.
This product saved my bleached fried hair this past summer and kept it pure crystal platinum, no brassiness. Thank you!