Many thanks Jan !
This is precisely the answer I was looking for.
And regarding the quality of your simulation, here is what i like the most.
It is not perfect yet of course, and some features are missing altogeher. But your team is 100% honest about it, stating in a list what it DOES NOT simulate. It is one of the first times I saw this and was hugely appreciated on my part. You can't imagine how many hours I lost on competing products trying to understand a behavior, just to figure out after many research that this was not simulated... Very frustrating ! And I told myself: okay, if these guys are crazy enough to publish such a list, they must have some confidence in their product !
Regarding the bugs, after browsing the forum and reading a few posts, I really once again appreciated your constructive attitude, and the fact that you are not denying anythig and working hard to improve it. By the way, I think I have an issue where the autopilot does not follow correctly the LLZ signal on autoland (initial capture is perfect, and when closing to the runway, it slowly drifts and had me land outside the runway). But I'll have to run some more tests when I have time and will make another post if needed.
And regarding the product itself, although i am not an airline pilot, I do love harcdore simulations. I have all PMDG products, and made the move to Aerowinx PSX a bit less than 2 years ago. What seems to make your product stand apart in quality is the feeling of "being there". Your virtual cockpit is beautiful, the sounds are the best i've ever heard, and those small "vibrations and shakes" are the first time i see such an effect to be convincing and not just annoying. Flight model "seems" (I insist on that as I can only judge by my feeling, and readings, and so on) really good, and general smothness is much better than with PREPAR3D (even with the same FPS).
For the moment, apart from the choice of aircraft (I would like to see the same quality on more "modern" liners), I don't miss PREPAR3D. The only product which is really in a league of its own is Aerowinx PSX (honestly, I'd say without a doubt that this is the best ailiner sim avaible to the general public), but you don't have this "immersion" factor that many simmers appreciate and that you got just right as it is a standalone sim with 2D panels.
After some more flying I'll try to post a small review on X-Aviation, but i really wanted to let you know that you can count one more happy customer !
Keep up the good work and see you on the forums for some more questions !
Charles