I have very long, dry, curly hair (3B, if you know that system). I also live in a cool, very humid climate. So frizz is a constant battle. I'm a bit of a product junkie, as many curly girls are - for every 10 products I try, perhaps 1 or 2 will work. And of those few, there is often an issue that's a dealbreaker: heavy scent, an unpleasant hard or tacky finish, or results that don't last into a 2nd day.
Well. This product makes a visible different right away. It increases my curl definition dramatically and delays the inevitable frizz a couple of days - which is huge. It also reduces tangling and 'spider-webbing' (the sticky, matting together that occurs when light drizzle and high humidty meets some hair products).
The only negatives are the pump - it is oddly hard to operate; takes a lot more pressure than usual, which is difficult if your hands are wet and slippery, as they will be if you apply this in the shower to very wet hair, which is what you need to do with curls. And the rather silly tiny size; it should be at least double the teeny bottle, which only makes sense if you have extremely short hair.