Oh... My... God...
First impressions are it's a smidge buggy, but what a sim.
First thing I checked for which I suggested waaaaaay back when Flanker 2.0 was released. Sonic boom. Go supersonic, do a fly by and you shouldn't hear a thing till the jet flys past.. then there should be a bloody great bang.
They listened!
Only had a bit of a play so far but it's beautiful and runs well considering. 1280x960 with 16x ansio and I get about 40-60fps in cockpit. Externals kill it a bit.
Here's a few (awesome) shots.