Blower Door Audit/Test

I had a free home energy assessment from my utility company. They recommended a blower door test through a contractor that costs $200. They’ll use thermal imaging to identify where leaks are in the house. The house is leaky, drafty, and 100+ years old. Is this worth it or is it BS? If we get the house insulated and the leaks fixed with the company doing the blower door test, they’ll credit back the $200. There’s a lot of room for improvement in this house, but would it be better to just get quotes from three different insulation companies for them to do their own tests + insulation. Thanks.