I dig this add-on so far, too, but an issue arises:
The aerodynamics. I use AeroBrakeMFD for planning my reentries and efficient flight in all regimes (i.e., best lift-to-drag ratio, coming in a few degrees below stall angle-of-attack on approach/landing, and so on); but I suffer the issue that the stall mechanics are very finicky. For example, I find that at takeoff, my stall AOA is around 12°, which is just fine. But when I get to higher altitudes, I find that flying at an AOA in excess of 1-1.5° kicks in some weird stall mechanic, and suddenly all my lift disappears (lift coefficient becomes 0.0), instead of tapering off past the stall point, which is the more accurate model. This makes for some very annoying bouncing in the flight path.
It also kicks in badly during approach; when I go to flare, the stall kicks in, and again, the lift completely disappears without tapering, and I drop into the runway beyond the vertical speed limit of the wheels, and *crashing noises*...
Having had some simulated experience as a pilot and aerospace engineering courses, this behavior doesn't really jibe well. No judgment, just rather disconcerting.