I only use MPI (Milk Protein Isolate) at the moment and have previously used unflavoured or added my own flavouring. I recently purchased some of BN's MPI chocolate flavour and as I am trying to add kgs I am mixing all my shakes with milk and not water. All I can say is this is the best tasting protein I have tasted in years, Mixed with milk I feel guiltly drinking it as it tastes so good I think it must be chocolate nesquik and not a good quality 40g or so serve of protein per shake.
Although unflavoured MPI is available at much cheaper prices I will be sticking with BN's flavoured MPI for some time now and am looking forward to my next order wich will probable be strawberry.
Massive thumbs up and highly reccomended here!