I've used it (Protein Factory's super bovine plasma) in the past to great effect. It's worth the money because you need very little compared to regular protein powder to see results from it. I quit buying it not because it doesn't work but because I quit supporting Protein Factory in favor of True Protein.
It made me much more aggressive ALL the time. I don't know by what mechanism this occurred. Does it increase test? It sure felt like it to me. Perhaps it has an effect similar to Humanofort. I don't know. It's supposedly way more potent in growth factors than colostrum. I do know you will "feel" this powder working if you use enough. I was using about 40-50 grams a day.