I tried using PAC for a few days. The battery drain for me was terrible. Every time I pulled my phone out of my pocket the screen was on. I think I screwed up by having active display and their notification screen enabled. Additionally, the 'blame the split screen' crashes were amusing the first few times but quickly became infuriating.
I'm currently trying out slimrom on my moto x. It doesn't have active display, but it's probably the smoothest rom I've used on the phone. I'm using an app from the Play Store, DynamicNotifications, which is a better option, imo, verse the built in AOSP version (which I believe is based on AcDisplay, but I could be
completely wrong about that).
I'm going to give slim a try for a few days, but I don't think anything will work as well Eclipse.
If you're set on an AOSP rom, give slim a chance. If you want a feature packed AOSP rom, check out LiquidSmooth (
http://xdaforums.com/moto-x/development/rom-liquidsmooth-v3-1-moto-x-ghost-t2781356). I think LS has the same features or almost the same features as PAC, but it didn't crash nearly as much on my device. I actually made it a full week before switching back to Eclipse.