Can anyone help with Janitorial Services?

Is anyone looking or currently operating in this industry that is open to sharing their experience? I've heard some stories on the typical podcasts and the space looks interesting given the recurring service nature. It's also one of the few service verticals where multiples haven't gone ballistic (yet..) Is the low barrier to entry and high labor turnover just a nightmare not worth dealing with? Any particularly attractive verticals or operating systems to look for?