I remember back in beta Alien Vision used to reduce energy regeneration. I can't really notice any downside to keeping it active? I find it easier to keep track of players in close quarters with alien vision on.
It's more difficult to tell if you are in a dark spot when alien vision is on --- "just be glad there's nobody named paperlikeabook to come and post after you. Then you'd be in trouble mister." - arleas http://imgur.com/QgO8q
It's more difficult to tell if you are in a dark spot when alien vision is on
I find that pretty important, and is the #1 reason I turn the vision off. Sometimes you need to understand how the marines are seeing you. --- "Life is like a box of chocolates. Diabetics can't enjoy either."