My old man has caught me off guard on the motorway plenty of times. It is only at over 100mph that I can start to pull him back (we have a really really long drive at home, not on public roads). Still wish I had brought one of them, although the interior is sh!te if you ask me. The fabric choice, not the build quality that is. They are really light grey cloth and just asking to get dirty.
My friend is getting one and he has a labrador....oh dear!