On my last trip to Gunsite, one of our instructors was a trainer for US Customs. He favored using the Sure Fire in and "Agressive" manner...constantly on and constantly moving.
I've come to the conclusion that I prefer the light on, sweep (and/or shoot), light off, move technique. This is especially so for us civilians where the technique is most likely to be used in the familiar environs of our home. (Disclaimer: not that I'm suggesting that an individual attempt to clear his home alone, except under the most dire circumstances.)