From what I've heard and seen Acers QC is abysmal.Still the best panel option for gaming alongside TN. VAs have great blacks and great colors (not as great as IPS though) but suffer from ghosting issues. And black crush.
I'm considering upgrading to a Predator X34P when it launches. I really want to get beyond 60hz and get rid off v-sync but I'm skeptical about Acer's QC. Too bad Dell doesn't make gaming monitors. Their customers service and QC are top notch.