My observations:
There's no real feeling of power from the engine. Acceleration seems anemic both in level flight and in a dive.
Controls as currently implemented are VERY twitchy. The Corsair had light control forces, but the level of bounce it's getting with small control inputs is absurd.
It bleeds energy extremely quickly. Corsairs were noted for good energy retention, but as implemented even short climbs can leave it drained of E and wallowing.
Even with curves set, light back-stick has her wanting to snap over. Weirdly enough, this seems to be a bigger issue in Instant Action and air-start missions, and handling is much more benign when doing a Cold Start free-flight.
Low-speed handling is kind of ugly. Despite its reputation, the Corsair handled well at low speeds. Roll rate was good and it was quite maneuverable, at least on par with the Hellcat, and superior to the Mustang. As-implemented low-speed roll is mush, and low speed turns just exacerbate the note above about even light inputs trying to flip her on her back.