While I totally stand by H&S for eliminating dandruff, I feel this is not quite up to their standards. I end up using conditioner as well.
After using a more natural shampoo for a while and turning to this product for dandruff reasons, this made my scalp sting and burn and I couldn't last using it!
It is pretty good for a 2 in 1, personally my hair hates 2 in 1 shampoos and I find I need to add in extra conditioner at the end of using this for my hair to feel soft and healthy. It did stop the itch and got rid of the flakes... but only after quite a few washes. The only real bad side is that my hair gets used to it so in order to keep the dandruff at bay I need to keep using the Head and Shoulders range. It's also a great price and the smell isn't too bad either.