I built and raced one in the race series years ago.
It was also my only car at the time. I had it for 3 years.
Flipping brilliant, like a four wheeled motorcycle. I built the first engine, which blew up in the first race, then paid for a proper race engine which was fantastic and lasted dispite my hamfisted thrashing.
As an everyday car you have to realise you need ear plugs and there is no security. I found that all fine, its weather proof, the heater worked very well and the electric windscreen demist was fine. Windscreen wiper blades were poor, but hey, its a bloody baslistic skateboard, so dont expect any more.
Its so low to the ground I would regularly drive under the barrier at the car park. You need to keep the headlights on all the time as other road users just dont see you or appreciate the speed, particularly on roundabouts.
For fun I used to come barreling up to roundabouts, the wild cam would dump loads of fuel out of the exhaust which would burst into flame as it came out on the passenger side. Passengers would crap themselves. They would also not get to grips with its cornering speed. It held the one make lap record at all the circuits except long ones like Silverstone. On the road it was simply unbelievable.
I did manage to spin it going round Hyde Park one night too enthusiasticaly, spun on some crap and ended up looking at four or five confused doubledecker busses.
Felt very safe, weighing 500kg the brakes were great, full FIA roll cage and telepathic handleing.
I would own one again if mountain biking hadent taken up all my time.