mangaed to find one on ebaY the other day used, but top condtion £60 posted.
They are simply an accessorie, but do hide the un-finised sides. And keeps the dust and enviromental du-da out! Takes seconds to fit and remove.
I wouldnt be so "simple" and just power the roof when these are fitted.
Failing that; memmory would click, once the motor gets a tad louder, I would very much remember at that point.
It`s always best to keep an eye on your roof in the mirror etc, it`s a good way of telling of any faults by checking the action etc...
I think they are a great added feature, and improve the asthetics.