I have got to do this place some justice. We were pretty lucky when we went - got the track to race between ourselves. It was tons of fun and our times were approx 22 and 23 secs per lap. The karts are solid as they run at a decent speeds (I would say realistically 50-60 kph). I do not think it goes up to 80 kph as they state since I floored it without ever pressing the brake for a large stretch of the track. The only downside is the the indoor track is quite small and simple.
It was a great experience nonetheless and I would definitely come back again!