There were four quadcopters at the show in Westlake Village, CA last night (well, 4 at one point, I only saw 2 return). I'm pretty sure they were all DJI Phantoms based on the LED placement. They were not invisible. I wouldn't say they were a nuisance, but that's probably just because I was more curious about them than annoyed. Maybe in a few years when the novelty has warn off they will be more annoying. I don't know if they were flown by locals, by the host, or by the fireworks company. I was a bit concerned that the operators flew right over the crowd at the end which seemed unsafe and unnecessary.