Those look very well engineered.

I am interested does Guru3d want to start doing reviews on case fans? wonder how it compares to noctua. I have a NF-A15 140mm it quiet in low rpm mode not so much at full speed, at full speed it more loud then my cpu fan, then again my cpu fan runs at 1000rpm only. My next PC gona have Fractal Design Define R5 Black, unless i find something else i like, between now and when i build my next pc.

I'd like to buy some of these, but can't find any for sale...