Yes, I am familar with deflection shooting. I have been playing WW2 flight sim games since Air Warrior back in 1995 or so.

For example, one time playing Il-2 BoP I came up right behind a JU-87. He switched to gunner and was shooting me. I was shooting him and nothing ever happened. We were quite close. Probably about 800 or so feet. We were flying a parallel course so no deflection shooting was needed.

Yeah they're tough to shoot down but are also a perfect example of why you need to be close. Try 150ft, dead serious, flaming in 2-3 seconds.