+1 for heating in the sun is not that bad with dark colours. My red one with black roof felt ok without ac yesterday at 28 degrees in the sun. But maybe it was because the sun has yet been at a lower angel at 7 pm.As for the heat: as some of you know, I was quite worried about the Donny Grey color because I was afraid of the heat inside in summer.
I can now say that it is far from what I know from our black SLK: the temperature inside the Grenadier, which has almost black Donny Grey, is much lower than expected. Today we are @29°C and the car parks in the blazing sun. It's warm inside, of course, but well below "hot".
My guess: first, the windows are pretty much vertical. Second, the privacy glass blocks a lot of the sun's radiation from getting into the car. And third, the roof is not just a sheet of metal, but a structure, and as such mitigates heat gain.
I am very happy about this experience.
Anyway I turned on ac after an hour to see how good it works.
It does its job fast and without to much draught in the car.