I just got Certified, spent 30+ years building and remodeling, plenty of time on roofs. I’m going to be using a drone from Day 1. I’m a realtor in Penna. Far too many times I’ve gotten the inspection report back and on regular basis some part of the roof didn’t get inspected. Chimney caps almost never get inspected. Just did roof on my own home over the weekend. No comparison. I’ll be using a drone.