I've never started a fire, but I melted a candle by shining the 12PM at it for a bit...
The car was heading towards me, flashed fullbeam at me so I flashed back. He stopped and sounded his horn. We were in the middle of nowhere, with only his car on the road. I seriously believe the 12PM should not be used near moving cars unless you intended to halt or crash them.
I've tested the 12PM against a "2 Million CP" spotlight run off a car cigarette lights (12V). The SureFire won - no question.
For signalling, I use assorted Photon II's. The 12PM is overkill, but you certainly get the attention of everyone!
I wish I'd got 1 rechargeable StealthLite & a normal one instead of 2 normal ones as the rechargeable is meant to be even brighter. The Beam is not SureFire perfect, but is very narrow and brighter than most MagLites and other lights (~2D cell etc). The Flashlight is as tough as anything, and I've never broken a Lamp (touch wood). I've snorkelled with them, and use them everyday.
I recommend the StealthLite. My next purchases however will be E1's, an M2, and either an M1000 or M2000 - when they go on sale.