"The Outside" is why people buy Cabrios. Namely, folding roof. This is technicaly said but it makes the difference. (If nothing else, it takes less time to polish the car:-).
Roof: On R19 Cabrio, the roof is made from black textile (in case of
ARIA model, it was a blue textile). It has more layers. The top one is wheather proof and
very stiff material. Medium layer is something like a sleeping bag. Thanx to this, the
roof provide more insulation than normal steel roof.
Roof maintenence: The roof is made to last "for ever". However, from my german manual (though I do not speak German) I understand, that textile roof should not be washed in automatic car wash, as the rotating brushes can damage it. It should be cleaned with the brush in the direction from the front to the back of the car. I am still thinking about getting some chemicals for fabrics protection. I have seen some cabrios with black black roof and I think that it was due to some chemicals used.
Windows: As I said, windows are frameless. It means that there is no
rail in which the glass could move. If watter has not to get in, windows have to fit the
sealings very well. If the glass is twisted, turned outside, contact between them and
sealings is too loose and water can leak through.
Some more or less serious pictures of my R19 Cabrio 1.8i