I had installed a bathroom fan in our ensuite, and didn't want to do the venting to the roof/exterior wall myself. I called 4 other handymen and none bothered calling me back.
Got a flyer from this company, and called them. They explained their pricing plan - I think it's $150/first hour, $45/ each after that. They sent a guy out a week later who did the job. It was done well ... caulked well, he used the right parts, taping was done well (I went into the attic to check).
They weren't cheap, that's for sure, but they were clear about their pricing policy, and the handyman that came out didn't waste time - he was as efficient as I think he could be.