I've been using Carnivor for about 2 years now. The chocolate and vanilla caramel are ok. Do not get the blue razz or fruit punch flavors. They are not edible. And no, none of it has a beef flavor. Add some cinnamon to the vanilla caramel and it's pretty good.
If you're wanting to try it for the flavor, you'll be greatly disappointed. There are many whey proteins on the market that taste much, much better than Carnivor. If you simply can't handle whey digestively, Carnivor is the best alternative on the market.
And, Vitamin Shoppe is the best place to buy it. Regular price there is $26-27, and they frequently have it marked down to $21-22 and u won't have to pay shipping. I haven't found it cheaper anywhere online, once you figure in shipping.