Ahmet, if you are interested, I would try it. As said, leave FSX intact and copy over the stuff you need to test. They had a one month trial once and I also think they offer refunds if you've bought it.

As you see, Mark and gandy are already very knowledgeable on how to run both sims and if you can invest a bit of time and tweak&fiddle effort, it may be an interesting experience. I wasn't impressed so far as I didn't see the benefit, but I can also see some very enthusiastic folks reporting, so perhaps there's something in between.  :)


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Or is it a modified Prepar3D.cfg to have all the same changes in all the same places so that it is "the exact same settings" as in the fsx.cfg?

That's how I understood the description. He also made some P3D 1.3 vs 1.4 video before that one. Must be somewhere on his YT channel. The neat part is that side-by-side view, allowing some good comparison.

I'm still training some approaches in FSX.  :D They should all work in P3D too, so if you guys want to join us, you're welcome. Ahmet already mastered them all, so he has free time.  :D