I reed an article posted here about having prot before and after. The result was that is better than having only postWO, but the study was done with only 6 gr of amino acids, not near to the amount we are taken.
I like to have a low GI carbo + prot meal about an hour before my workout and a high GI carb + ~35 gr of prot postWO.
I know my postWO shake is ok, but I am not sure about the preWO one.