Cold Blooded pro is awesome. There's been a few times when a group of enemies ran past me in plain sight (giving me an awesome target on their backs) because of it. I just started using scavenger and will most likely not switch back to Bling because it's so bad ass. If you can live long enough you have an unlimited supply of ammo and explosives. I had fun last night setting up a ring of claymores around our captured flags.