After flying the Yak-9 in the FSO and main arena a few times, I've been flying it die hard in the main arena where surprisingly it outclasses most planes.
P51s it can catch or stay with even on the deck, given decent alt the Yak is quite a handful, I will say the gun package is a serious problem as you can't take deflection shots and expect to take a wing off.
However my aim is above average and given the few fights I had, its quite nice for 23 eny compared to a C.205 or 109g6 which it totally out classes.