This is pretty good for fattening up fine volume-less hair like my own. I apply this all over and blow dry, and then flat iron. My hair feels thicker and silkier. I don't like the scent though - it smells like a drugstore lotion or a fragrance a "mature" woman would wear. Fortunately the smell goes away upon drying. If it were unscented I'd give it the 5.
I've only used this several times, so I will update with any developments. So far I like the results though!