I have your flexible borescope. I’m amazed by what I can see inside my barrels with it!
I took a look at a pistol barrel to see how steeply the rifling started. I thought I’d cleaned that barrel thoroughly, but WOW was I wrong. However, the borescope also let me verify after a second cleaning that I got it right that time.
I agree that it’s a little challenging to keep the flexible scope oriented, but with some practice I got the hang of it. I have taken pictures of gas ports with it pretty easily.