Whey is going to get digested fast no matter what, so you guys paying 4 bux a lb difference for isolate to concentrate wont give you a big difference is size gains, as to post workout shakes...the carbs are just as important as the protein is to stop coristol, to spike insulin, to replenish energy needs, and to shuffle protein and carbs into the muscle cell where the growh actually occurs, oh and it's also said that you recover twice as fast if you do that...On the other hand, the perfect shake to me would be 20G of whey protein, strawberry flavor, 2 raw eggs, 2 table spoons of cottage cheese, 16 oz of milk, mix it up and drink it, it tastes good, with the best quality proteins in.