Sprint – good if your controller doesn't fail in a match... happened twice, no real faults

Active Camouflage – My favorite, though the radar-jammer lets them know your sneaking up on em, if ya see dots watch your back

Jet Pack – the damn pack gets stuck in hallways and can leave you vunable to attacks from pretty much damn everywhere... and if you don't get an angle with a running jump ya go straight up and look like a dumbass

Armor Lock - again straight up in the right situation but don't do it where someone can sneak up on you and assassinate ya

Evade - good for bad situations and can send you to a great fall if you randomly barrel-roll... cost me a few lives due to bad rolls