I am considering buying one, and I am wondering how the "ProLine" Beasts compare to the Champion Beasts. Were they more stable? I like the flippy Champion Beasts -- especially the ones in the very pliable translucent plastic. From what I hear -- most people like a stiffer plastic and the newest Champion Beasts I've seen are more opague and less flexible plastic. Are the flexible clearer Champion Beasts a thing of the past?