Started with Promethean Vision thinking it was overpowered and that I'd never switch.
Then I discovered Hologram and how much better it was than in Reach, and had endless fun tricking people, watching them try to assassinate my hologram while its running into a wall....
Then people caught on to them and I tried jetpack. I honestly don't think I'll switch to anything else, except in certain cases like big team or when the other teams camping corners with boltshots. Its so fun and so good, especially for the way I play.
And this stillness of life did not in the least resemble a peace. It was the stillness of an implacable force brooding over an inscrutable intention.