I first did
ON whey isolate, their extreme chocolate flavor and have never tried any other brand. It tastes like nesquick, really good stuff.
I've also tried 2 different flavors of ON
casein, first the chocolate and now the vanilla. The chocolate was horrible, my god, bad. Vanilla isn't really vanilla, it's really synthetic flavor, but not bad. Def better than chocolate, but I'm sure there are better casein flavors out there. Almost done with my 5 lb tub of vanilla so next time when I go to GNC, I only go there for ON products, I'll look for another flavor.
lol, funny story, when I went to get the vanilla for the first time at GNC the guy came right up to me and suggested GNC brand. My first thought was 'fuck no!' but then I just asked for ON and he pointed me to the back. Shit but they are fast to recommend their own brand.