I can't tell you any more about how good this is without being redundant, but I can give you additional information that would have helped ME:

5 stars for a dandruff shampoo combo that consistently works! For whatever reason our hair/ scalp decides to get used to a dandruff shampoo and become immune to it, I have yet to run into that problem with Selsun blue. I started using the 2in1 version just by chance, but it really leaves my hair I feel more conditioned and squeaky clean. I have oily hair so that's important to me. Im really thankful im done trying different dandruff shampoos. The gross dandruff stays gone and I cannot be happier.