Apparently this product is the result of a new scientific discovery (really, this is not marketing blurb). My hair is naturally fine and wavy which is a recipe for frizz when the air is damp or humid. This product works really well and you don't need as much as they recommend in the manufacturer videos (which is good because it is very pricey). If the air is really damp my hair will still curl up, but there is no frizz which means it doesn't look messy like it used to. My hairdresser now uses it on all her frizzy haired clients as she was so impressed on the results on my hair.
I don't use the shampoo or conditioner, so this is a review just for this particular product. I would like them to bring the price down but even at this price it's worth it because none of the other products I've tried work at all, this is the first to deliver on its promises.
I would give this five stars if it wasn't for the price.