I did a week crash course years ago and failed it cos i had too many bad
habits, which came from barraling around my mates farm in a Chevette with
welded doors ..

.
So speed was an issue on my lessons ..lol.
I think they are good for people who can sort of drive already.
But for people that have nooooo idea i think they can be dangerous.
But then again people can learn for ages and still be crap !