Played 1.7.1.5 today - zombie detection was waaaaaaaaaaay better. I'm happy I read what Rocket was saying that it was wrong in .4 and reserved judgement until now. Combined with LoS, and Zombies actually acting like Zombies, I really feel like I'm on the edge of my seat every time I go into town. Combined with actually using cans/bottles to distract them, it makes me really happy for some reason (even though I'm tricking something way dumber than me). I'm pretty impressed with the AI now: it seems when I crouch run a little too long too close to a zombie, they start heading over to my location - slowly. You have to get the hell out of there without freaking out and running and you're fine, but it's still intense. Makes starting with nothing but painkillers and a bandage a lot less impossible, and actually a little fun.