A few weeks ago, I bought a quadcopter. After I learned to fly it. I've been practicing getting good video images. I decided that I would use it to inspect my roof. I haven't been there in years. In any case, I was able to find a small depression in the roof, which is not visible from the ground. I went up to the attic and found a place. I must have stepped on the H-clip. I looked at the rest of the roof. Air vent turbine, tarred the seams, and attaching solar panels, gutters, etc. All the blessings. Besides, I didn't have to go up the stairs.

Now for the funny part. I flew it across the stream from the cabin. I turned it to take some pictures. And then I realized that I had not finished painting the wall of the wing, which stands on the steep Bank of the stream. This wing has been there for 13 years, and I never noticed it.
So if you already have all the necessary tools. About the same price as a decent cordless drill. You can get a nice inspection camera that you can have fun with when you're not checking things out. LOL.