I've a question - I'm only level 17 so I wouldn't know - Are you given a choice to revive, or are you revived automatically with Laz nades?
I've only used it on people, but they appear to get up faster than if you throw them syringes. So... maybe its automatic?
Also, you get 100xp for hitting someone with a Laz and 100 points for the revive. Hitting a group is an XP mine.
Because of the throw you can nail people from a mile away with it. I was running Medic/Sniper from the objective I was guarding, ultimate support guy.