The Nanoxia's CFM specs look plausible, and considering the fin design, they probably are close. And considering the fin design, radiator performance is probably not their strong suit. As for noise...I haven't tested a colored/translucent fan that I would consider 'good.' The plastic probably causes a lot of minor excitation that standard black ABS doesn't. I have heard good things about this fan though...

Ultimately, if you're looking at that fan, it's for looks. You should buy it for looks as well.

As for the Ultra Kazes....I find them interesting. There's no real 'need' for high static pressure fans. S-Flex fans have decently low CFM drop (26% at 50CFM), the Zalman has kinda low CFM drop (27.5% at 50CFM), PTS Yates have low drop (26.7% at 50CFM), and even the Minebea 1900 has respectable drop (32% at 50CFM), the Sharkoon has low drop (25.5% at 50CFM)...and all are great open air fans.

I'm not sure if I agree with making fans that sacrifice either open air performance for radiator performance or vice versa (I guess it makes sense that the Slip Streams came out at the same time)...the overall design loss of trying to get any worthwhile in gains hurts the 'otherside' too much. For instance...Noctua S-12 is damned good in open air....but ANY sort of restriction hurts it below competitive levels....in the other direction, I suspect that the Ultra Kaze's motor is very high torque, which often leads to extraneous 'efforty' noises (Panaflos are one example IMO...). That said, I've always presumed it to be a good fan like the S-Flex and the Minebeas. BUT, the few users who have bought one and reported back have not been impressed.