It is odd how many people "wish" for a roll-back, but the delay it would cause would be really annoying, and as I understand, it would be for a computer reset, and take about twenty minutes.
I consider myself very lucky, that having ridden it lot's of times, I have never had a roll-back and don't want one.
......and it really stings in the rain, they put me on twice on the front in a shower last year and I backed out of a third, as my hands were stinging from protecting my face.