Qualitative opinion as someone who flies drones for fun and profit: yeah, drones, specially the bigger ones (e.g., M600), can be really loud. Once they get abov

Qualitative opinion as someone who flies drones for fun and profit: yeah, drones, specially the bigger ones (e.g., M600), can be really loud. Once they get above a certain altitude you won't notice the noise, specially in a crowded urban setting, but in quieter residential areas I could see this being an issue. As others said there are ways to mitigate the noise, but at the cost of efficiency.