I have my performer on my wood deck, and it scares the hell out of me. I'm super anal retentive about checking under the grill and shutting things down. I'm also diligent about keeping the ash catcher pretty empty. When it gets full, I have had a hot coal fall out when working the vanes back and forth.
A good friend of mine literally burned his house down about 10 years ago due to a stray hot coal. He was using basic kettle with the ash disk, and guessed that the wind blew a hot coal on to the deck surface after he had shut all of the vents. He was awoken in the middle of the night by one of his neighbors banging on his door yelling the house was on fire. It lit the deck, went up the siding into the soffit, which lit the roof and trusses on fire. Essentially the whole attic was on fire as the airflow in an attic is a perfect chimney through the ridge vent. No smoke detectors had gone off. Everyone got out safe and he has a nice new house but has sinces switched back to a gas grill. Scary shit