They're a curse on the roads, because they tend to drive very slowly in the scooter lane, forcing you to maneuver around them. They're also a curse when I'm at home because I can easily hear them on the 7th floor and they tend to drive around my neighborhood for about 1/2 an hour.
Here's a recording of one from my apartment window. Don't be jealous of my view. You can see the truck go by pretty early on but still hear it for the whole video.