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Champ beast was my first driver after the DX starter set. Currently bag a nicely beat in star that has some good turn to it. If I'm not sure what disc to throw, I go for the beast. Really versatile.
I've thrown the prototype C-line (177g). Flies pretty similar to my Emac truth. I'ts a little deeper and has a pretty flat top. I like it best for forehand tunnel shots and backhand baby hyzer flips. Not the best choice for a headwind. Fade is ~1.5 ish.
Here's a link to Dave D explaining what the Grenade is about. Inaugural plastic is somewhere between nexus and Kc pro according to him.
http://www.innovadiscs.com/disc-golf-discs/how-the-ricky-wysocki-grenade-putter-was-made