actually not all whey are created equal. There are 2 types, whey protein isolate & whey protein concentrate. From my limited knowledge, whey protein isolate is more expensive. Not sure whether its better or not. On Whey is an example of whey protein isolate. For me, cost is important (since I take a lot of whey), so I am using Scivation Whey (10lbs for Rm300). Its whey protein concentrate. The only difference I find between ON & Scivation is that I get really thirsty after drinking ON whey. Other then that, haven't really noticed much difference. BTW anyone here using the whey 4Rings is selling? Price is really tempting .