So I rolled out onto the Halo 4 to test the new tuning, loved what they did but the main thing was the Regen Field, I never remember it being as powerful as it is now, some people may miss the defensive drop shield and bubble shield from the past but that can only hold off the attackers, letting you heal etc but also allowing them to aswell. The Regen field is just so useful in keeping you alive since it only helps you not your enemy. I popped it down in a 3 v 1 fight, I had the BR, I take the first guy with about 25% damage to my shields, by now they have all noticed me, I walk behind a standard UNSC barrier at 60% shields, in about 2 secs Regen field is down, I throw a plasma nade and pop out at full shields taking shots, I have a one second cover to Regen more health and shield before finishing them off. Now have them buffed the rate at which you place these down and the rate it starts to Regen your shields because it seemed very short too me.