I`ve used bio-x, optimum, eas, champion, sci-fit, kaizen, designer protein (Dan Duchaine`s), biochem, cytosport whey, iron teck, allmax, whey one and ultimate nutrition. 90% of the time chocolate flavor mixed in water. The only one I never liked was that prostar crap because it just did not mix. One`s I haven`t used but would consider are pvl and dymatize. On physiques site the pvl 10lbs is very affordable. If anyone knows what it compares to taste and mixability wise, please fill me in, would like to know about the dymatize as well.

I`ve always used the concentrate primarily blends. No big problems with digestion, as long as it tastes o.k. and mixes well, I`m happy. The optimum has isolate listed as the first ingredient, so I think it`s a good buy. Plus now I`m at my biggest using the optimum so I may just stick with it. Just was surprised to hear so many bad reviews. I take it you only use an islolate 5151?