It seems to work fine, everything I've tested works. Four things I've noted though.
1 - Craft sometimes feel a bit floaty at low airspeeds ~100m/s. May just be my new designs from 1.8.
2 - Performance hit is more noticeable than the previous version, more so on the ground. In the air it feels fine.
3 - Seems to have trouble with the FAT-455 Aeroplane tail fin being used as wings. Uncontrollable and extreme roll rates, even with the roll rate tuned right down.|
4 - Coordinated turn appears to be stuck on, regardless of whether the button is selected or not.
Apart from those, control authority is fine, Stability is good and all the stuff I've tested works.