Yes we heard about it and this sim has been widely discussed over several flight-sim forums. The summary is:
- it's beautifull
- the flight models are interesting
- the cockpits are way too limited, nothing clickable, very basic avionics, nothing to do excepted aerobatics
- there is only Switzerland, no addons. This *might* change in future.

So in the end, the game is fun but cannot replace FSX, and it will need several years before it becomes a real interesting sim (with complex planes, complex avionics, world scenery, ATC etc...).

Same goes for another sim called Outerra, which is even more limited that AeroFlyFS.