As an S401 person, I'm a fan of the hex design. I'll have to go check out the reddit post to see what people were saying about it. Personally, I think it creates a visually interesting pattern (vs round holes or even-grid rectangles) while making the case incredibly open (vs, well, round holes) and retaining structural strength (probably have the stock material choice to thank for that because, despite being so open, that thing is still incredibly rigid).
Psychologically speaking, perhaps it's because I've always liked Honeycomb cereal but we never bought it when I was a kid... Maybe I need therapy more than another computer...
On a different note, I was just over on
this XSPC radiator thread for thin rads. I have zilch-o experience with loop builds, so I'm hoping someone with more knowledge might be able to provide a prognosis for how these might work in a potential S700 build.