I have it and have a few problems with it.
First, load times are extremely long. This sucker needs some optimization badly.
Second, it's a bit buggy. It doesn't appear to do enough vid card capability checking and bumping up resolution, filtering, and checking anti-aliasing resulted in a total system crash and reboot. Lower graphics settings work so it's possible it just asked the vid card to do something it couldn't possibly handle.
Third, in the demo, instant flight starts you on the ground but in FSX deluxe, instant flight starts you in the air. I played with the game and settings for 3 hours and never could find a way to set it to ground launch. This is a hideous oversight IMHO.
Overall I think it's going to be the best customizable civvy flightsim for the next few years, but it's really slow and buggy right now. It looks pretty good even with low graphics settings, but it has enough higher settings available that it will look better and better for the next couple of years as computer hardware improves.
I'd give it a "buy during holiday or post-holiday sales" recommendation... It's nice and definately next gen, but I think it was released before it was ready to make sure it was out for the holidays. I'm hoping for a few patches soon.