Hydrowhey is a VERY thin protein. It is meant to be processed differently than isolate, even more readily available for protein synthesis (muscle building). It is a tasty product, and ON is a great brand, but you will be paying more than you need to. The results just don't increase in correlation to the price. It is very effective, but no more than an isolate, or even a concentrate for that.
Really, if you are reading reviews for more information than flavour (which, as with almost all ON wheys is great), then you should not get it.