I don't know what gives you the idea that the case has been tested "with robust exhaust fans", note, plural, since there isn't anyplace to mount an exhaust fan, AT ALL, except in the rear of the case? And since you can only mount a single exhaust fan, there is no way to compare how well this type of design MIGHT work IF it did in fact also have a top rear fan location available, so it's impossible to say that it's positive pressure configuration would outperform the same design with some slight modification that would allow for equal or negative pressure performance. There is simply no way to say that either way works better in any given case if it's not possible to test a given configuration in that case.
And, I don't see ANYTHING in the design of the rear panel that leads me to believe that anything special has gone into it's design since it looks 100% EXACTLY the same hexagonal mesh material used on the back of practically every FD case that's been manufactured in the last five years or more. Including my S2, which also has great airflow.
Not to mention, the case has now been recalled due to a faulty fan hub controller, so that's very NZXT-ish of them. Again, I really like FD, more than pretty much any other case manufacturer, and I'm sure it cools well, but personally I'll take a hard pass. Not to mention, the case looks about as ugly as most of the Cooler master designs, unlike practically every other case Fractal sells. Personal preference is compulsory however, so to each their own.