In reply to Nathan8816:
I've not tried the newest iteration, but the model this claims to improve on is very good and at least as good as WC Zeros... probably a bit better trigger action, in my mind. The newest model looks very similar. If you can get them at a good price, I'd say crack on. Totem cams have a narrower head size and Z4s look very swanky, but the Alien Revolutions were great.
There is some chatter about Alien Evoutions being crap, but that was a design flaw that was corrected with the Revolutions.
Hope that helps!