i've driven rotax a couple times, the last was the championship track in thailand and i drove the car of one of the top mechanics. he said my lap times were what the little kids would run in the kart series lower than it. i was fine with that time it's scareh trying to just learn where you can go and take things flat out when you're doing 70+ instead of the 35+ maybe 40+ of a typical indoor/outdoor kart.
can't imagine how terrifying ripping around in this thing would actually be!