I once did a flying experience from a (since closed) Air museum in Cornwall, in a Chipmunk trainer. I even got to fly it for about 10 minutes - and I can tell you that PC flight experience using a flight stick and rudder pedals does actually translate into the ability to control the real thing as long as you're not doing aerobatics.
Anyway the point is that when I got a Rift CV1 and IL2 in VR and I was flying one of the planes I got flashbacks to the time I was flying the Chimpunk.
It's THAT realistic and immersive. Well worth getting (even if I can't fly in IL2 well at all.)