Played a 1000 point game the other day, Warcraft: Orks and Humans... Err space marines.

My psyker rolled fire shield.
Never used it before, but the opponent had rocket copters, so I figured, why not?

My bike squad got squished down to just the Sgt. (no upgrades). So, he zipped up right next to the nob/warboss squad. The orks couldn't resist, so they charged. The Sgt challeneged the Warboss! And the warboss accepted. 2d6 str 4 hammer of rath hits on the warboss from the fireshield. Almost killed the warboss.

Moral of the story, fireshield is entertaining if you are trying to go out with a bang in the end!