The Maxi-Milk ready made drinks are good value and taste lovely. I prefer these to the powders that you mix up yourself to create a protein shake and, at Amazon's price, I feel I can justify buying these shakes.
Edit 30/4/12: I rated these 5 star initially as Amazon were retailing at approx £9. However, the price has near doubled now so I cannot honestly say they are value for money anymore. I won't be buying anymore at this price.