I did not think ventilation is big thing either, as its just spraying acrylic paint with compressed air... It shouldn't be much more to air than with brush? But maybe I am entirely wrong. My reasons of not doing it is: - Space: Would need place for air canisters and needle and hoses it comes with, plus whatever motor it needs. - Maintenance: I am not sure if I am that keen on cleaning the needle, seems more hassle compared to cleaning brushes. - While not super dangerous, I do not know if I need compressed air canister in the house.