Okay, my first impressions after about 40 minutes at VIR.
First entering the cockpit its clear that something has been lost in translation. The sounds aren't all there, which is understandable as the sound system must be different between rF2 and AMS. Gear shift sound isn't there, idling sound is lacking from the rF2 mod. Happily the meat of the sounds are still there with that great low speed transmission whine that really sell it that's missing from so many professional developer cars in many sims. If anything though the sounds from the exterior camera sound much closer to the rF2 version than the interior sounds. Watching the car in replay is a treat as the model is 5 stars, even with an animated rear fan, and the headlights are perfect.
I drove the car without any TC so this is my impression of handling without realistic assists. The car's default realfeel settings, which are default to all mods that don't have custom settings chosen, is pretty heavy and rather uncommunicative compared to Reiza cars. Using
@Paulo Gomes FFB settings are much nicer so I recommend trying them. The car feels very planted, very easy to keep on the power. Braking is pretty good too and its hard to lock up unless you're really pushing. When it does lock up its very predictable and its pretty hard to spin the car overall even without TC. Default set up has gear ratios that are way too short any sort of high speed track. Around VIR I was hitting the limiter before I was even halfway through the esses so you need to bump the entire thing up so you're using a lower gear per corner, where you use third you should set it to use second etc.
Top speed was surprising as well. I wasn't hitting above the 150s even on the long straight at VIR so I wonder if this is set up related as I didn't take any of the wing out to test it or if there's an issue with how fast the car is supposed to go. 150s seems slow for a GTLM car. Also the set up screen shows the Fast and Slow bump/rebound as locked together which I'm pretty sure you should be able to alter separately and can do in the rF2 version. I only tried softs. In 8 mostly clean laps at VIR I knocked the fronts down to just above 80% and the rears were mostly around 90% I think. My lap times were in the 1:48s with lots of time to find. I assume this is not this year's C7R so in 2014 pole was in the high 42s and most cars in the 43s. I'm skeptical the car can match this, but I need to test more to be sure.
The shift lights do seem to not function quite right and ask you to shift earlier than you should. The comment about the shift up leaving the lights already on blue is to do with the gear ratios though. Widen them and lengthen them and you'll get more normal lights, though it will still ask you to shift too early.
Overall I'd say its a fun car to drive. Its a bit below the quality of the one for rF2 and this isn't surprising. It will need a few patches to get it ironed out. I plan to drive it a lot more even before those patches come. I'd recommend everyone give it a try.