I was unsure whether to give this four stars or five.
My only gripe is that, at high speeds, it can become very bumpy (almost like it's bouncing violently). This can be extremely uncomfortable in VR.
However I opted to give it five stars as this could be a real 'feature' of the karts due to the small wheels / stiff suspension and not an issue with the mod itself.
It puts me in the unfortunate position of finally having a decent kart model in Assetto Corsa, but I can't use it in VR!