Chaps,
I have some good wingmirrors on my S2. They are heated (and turn on with the rear-window-defrost switch, as already posted - someone obviously wired them into the correct circuit) and are also electrically adjustable.
They also work quite well - OK, not the best positioned to see in, but not half bad. And they give a good field of vision as well. (Nothing to compare with the view of a set of 944 rear haunches in the wingmirror, eh?) They don't flip down when you put it into reverse tho' (although this was an option on the E46 BMW's as well, I believe).
They also seem to suit the slightly slabby-square design of car.
They're called the original mirrors, and I quite like them!
Oli.