Pros: -Zombies are slightly more of a threat, but only if more than 4 rush at you. -Spawning of Zombies makes it seem like there are more all over the place. Nice post-apocolyptic feel to the game -Killing a Zombie with a gun spawns a zombie that knows where the last gunshot was, causing them to run to that location, and most likely attack the shooter. Makes it seem like they are swarming (which is neat, but it could be done better) Cons: -Because of infinate spawning (or what seems like infinate spawning) you can no longer reliably clear an area. Zombies should be able to be wiped out of an area, at least for a little while, before comming back. -Sometimes they move too fast for their own good. I've had 4 or 5 attacking me at once and missing me over and over again by simply side stepping like an inch and watching them flail wildly past me. Epic lulz, but deminishes how threatening they are. -Still clip through walls. Makes looting on the ground floor of buildings dangerous for all the wrong reasons. -Can sometimes be annoying for newly spawned players if there are no melee weapons readily available.