I have the clear bra on my Speed Yellow 2002 Boxster S. It was installed by one of the two prior owners. It covers the nose, rearview mirrors, the rear quarter of the wheel arches, and halfway up the hood.
It isn't noticeable unless you're within a few feet of the car, and I like the protection it provides to the finish. Wax on the leading edge isn't a problem since I use Zaino instead of carnauba wax or the like.
I would pay to have it done (and pay a little more to have it done right) if I were buying a car like this brand new.