Per se, this is a decent mod.
The cars look good (interior and exterior and fairly realistic.
The damage model is great: When these cars wreck, much of the car may become separated (tires, engine, entire front end, etc.).
The engine noises are very pronounced and realistic, and somewhat distinct.
For the better or the worse, the interior cockpit view of these vehicles is somewhat limited and small -which I didn't care for- but this may also be ultra-realistic perfectly modeled from the actual real-life vehicles. The three rear view mirrors in the cockpit view are all EXTRAORDINARILY-DIMINUTIVE to the point of being worthless.
With traction control set to 'maximum' ("high"), these vehicles were a little too difficult to navigate around any track, using the keyboard steering mappings: Tires don't have enough grip and/or the driving physics are unrealistically-hard resulting in many spinouts and oversteer. I can set the traction control to "medium" with about all other GT car mods that I have downloaded for rfactor -- and this results in better traction and control of the car when racing on any given track.
This is a decent mod but a few too many major flaws and quirks prevent it from being a 'keeper' for me.