I've seen the blue roof and, yes - it looked very good, really brought out the blue in the atlas grey paintwork, especially when spec'd with a blue interior. I'd be a bit concerned in the duller winter months that the blue roof was too big a contrast to the atlas grey , which in such lighting is almost black.
Park a black roof one next to a blue roof one and...
...in winter light you'd opt for black,
...in summer you'd opt for blue
consider your local climate and intended use
Here are few of my 987S in winter light..
and one in August lighting..