I’ve just finished my first flight - quite a lengthy one around Lincolnshire, so thought I’d come back and give my thoughts while still fresh in my memory.
First off the sound was nowhere near as awful as I was expecting after reading all the complaints. I moved the throttle and prop rpm controls very carefully and the transitions were not too bad at all - and although the engine sound was loud to start with and during take-off, as soon as I lowered the rpm on climb-out, the noise lowered to what I would expect. A bit on the noisy side, but nothing too bad.
I definitely noticed subtle changes in volume and pitch as I altered the rpm and throttle settings during the flight - and I actually thought the sounds on approach to a tiny strip along the side of a rugby field (so very short) were very convincing. There were some different sounds appearing now and then as speed and rpm changed that I didn’t really know what I was hearing - but it didn’t kill the immersion at all.
Strangely, after landing (in less than 100m) the engine noise was much more quite than prior to take-off even with 100% rpm (or maybe I’d just gone deaf by then! 
).
btw I flew in VR using the Valve Index at 150% SS and 100% render scaling. FPS was totally solid at 30 - smooth and zero stutters.
Someone asked about the zoom-in being OTT - and he is right, it’s far too strong. However, I found that if I looked at the windscreen central spar and zoomed in, it didn’t go in as far and I was then able to look down at the instruments, GPS etc in comfort - and it’s then quite clear without having your virtual nose pressed up against it.
The main thing for me - and what left me considering a refund request - was the awful instruments. Especially the centre panel with the engine gauges was awful and so fuzzy and illegible it almost made me queasy. Even the larger six-pack was not clear and I can easly say this is the worst panel I’ve seen in FS2020, for clarity. The warning light texts are bad, too - impossible to read or even guess what they are until zoomed right in.
During the flight I had a pneumatic pressure light illuminate - no idea why and what to do about it, so I just ignored it and everything went fine.
Another point - I have the prop rpm and mixture assigned to separate dials on my Virpil T50CM throttle and they work very well with all aircraft. Usually.
The rpm control was fine and smooth as ever, but that mixture control was a nightmare. The latency between rotating the dial on the controller to the lever moving in the model was so bad that I actually cut-off the fuel during climb-out and both engines stopped.
I was able to restart them before augering-in - this thing is an awesome glider!
One last point - it took off in around 20-30m on a grass strip (Fenland, EGLC) with 20° of flap.
I decided to keep this model, even though I’m pretty sure the panels and gauges won’t get improvements, because it was my fave short-hauler in FSX - but it’s the first and last model I will buy from Aerosoft for this sim.
I’ll be reading the manual over the coming days - hope to find what that pneumatic fail was all about.
PS - I don’t use the AP in short-haul aircraft so no comment on that.