Actually I found the airplanes to be more realistic than the heli's. I never could hover one on the sim as good as I could a real one
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You can change the airplane settings to match your real plane and they will be real close. I flew the P51 several times before first P51 hoping I would find no suprises.
My actual model will snap on the top of a loop if you don't have enough speed and use to much elev. Not something you want to find out in a new model. The one on the sim, just kinda noses down.
But you are right the P51 is nice. Modify it and put a screamer engine in it, good way to build reflexes