I'm a new player and i'm unfamiliar with units becoming outdated. From what i've gleaned from the forums, once they've updated to a different looking suit/unit/vehicle you can't use the old one in tournaments. First of all, is this true? And secondly, I want to start a tau army and the crisis suits (not stealths) look the same (source: looking at the new box set art they're selling on the games workshop site), but almost everyone in the tau forums says not to buy them. Am I just getting bad information because no one has looked at the new box, or am I missing something?