I was helping my wife with her epic pali quest in Scholo when I got merked at the boss and no one for a battle rez. So I came back and accidently aggroed 2 of those spider looking creatures there when trying to get into what I found to be a closed door.
Second wind saved my life. Every 10 seconds these 2 spider mobs would throw a net on me. I would regain almost every bit of health they hit me for. I am so glad I speced for it. I was able to take 2 59 elite instance mobs by myself without a pot or heals because of this skill.
To anyone going arms. I feel that Second wind is a must have and surely you will like when it saves your bacon.