I bought a small sample of the PhD shampoo to take on vacation. I have absolutely loved every other Living Proof product I've tried, so I assumed I'd love this, too. But I don't. It doesn't lather (which is fine, I'm used to sulfate-free shampoos by now and they don't all lather much) but it also doesn't spread well in my hair. I have long hair, so I feel like I have to use a ton of this to get it evenly distributed. Also, it doesn't seem to rinse as clean as most shampoos I've used. Maybe it's the hard water we have here, but I feel like I either waste a lot of water rinsing or I have an itchy scalp for the next day or two after using it. I love the smell and, once I use a lot of shampoo and rinse, rinse, rinse some more, it does leave my hair feeling clean for several days (an admitted plus - I have dry hair and don't water-wash it more than a few days a week). Overall, though, I expected better from this brand. Maybe for people with short hair and soft water!