I had problems having my key validated but REX support helped me out eventually and sorted it out within 2 days. My REX Atmos is now up and running. A great product, even if one does not faff about too much with the settings. This product really makes a difference. I can recommend it if you manage to get it to work.
After the update my FPS are a lot better (although the airport uses a lot more resources than any other airport I have purchased, including iniscene Heathrow). The detail is fantastic and this EDDS is certainly the better of the three on the market at the moment. I give it 5 stars, although the VOR facility at the beginning of runway 25 threshold is not depicted, the journey from the airport along the taxiway to 25 shows a fence along the autobahn although in reality, it is a reddy, brown wall all along the airport. The taxiway signage is also not as good as it could be (little signage on the grass informing the pilot which turn_off to take). These things are graphical quirks and I am sure th at the developer will want to rectify thiese little quibbles in the next update(s). Thanks for a great airport. By the way, my PC is not a high-end PC but this airport is now very usable.
This product enhances the MSFS world immensely. Anything that improves VFR flying is greatly welcomed and FS Birds is such a product. Thank you for creating a great product and for making MSFS more realistic.
At last, Stuttgart airport, and such a beautiful rendition of this msfs 2020 "forgotten " airport. I thoroughly enjoy flying into Stuttgart. Unfortunately, this product warrants only 4 instead of 5 stars because the Arrival (STAR, etc.) is only set to Automatic, which means one cannot fly an ILS, only a Visual Approach. A bit of a shame really because after having created such a great product one "forgets" to include important waypoint data for the Arrival. I can still recommend the product though. :)