I played in both games last year (There was a second round Spring Quarter most people didn't hear about, but overall went a lot smoother than the first one). It's a ton of fun and I would massively encourage anyone curious to give it a try. There's no need to go to every mission if you're schedule's busy (I only did 3 missions each time) so there's no reason not to sign up.

If you're interested, but don't have a nerf gun, I'd recommend getting a Maverick and some extra darts (you don't stop to pick up your darts when you've got half a dozen angry zombies chasing you.