The run off real isn't a problem. In the areas there is very little, your car doesn't want to point in that direction if you do lose it, and due to the low speeds (I believe max speed I heard on the day was 130KM/H. Eric can confirm what he was getting down the straight in the GTR). If you do lose it, you don't get that far off the track (Unless you're Duncan and do it with WOT in 3rd with 400RWKW being let loose... And even then, it wasn't a big off)
The track is awesome as Duncan said. And we will be booking it again.
We had 3 cars who had issues with noises, and they all ended up being allowed to run, as the MDTC staff will help you to quieten it down, in quite a smart way.
In regards to booking again, we can basically pick a date that is more then 6 to 8 weeks away, and we can nearly be guaranteed to get it.