I subscribe to the same school of thought with my computers as many Victorian aristocrats did regarding children;
They should be seen, but not heard.
The Riing is a high static-pressure fan with a very nicely balanced motor and blades, rubber isolators at each corner on each side, and according to Thermaltake, a special blade design that's supposed to reduce vibration without adversely affecting airflow. I'm not sure about the blade design, it looks pretty bog-standard, but I'm definitely a fan of the motor design and the shock mounting on the corners.
The acrylic band around the center of the unit creates a super cool 1980's cyberpunk look that is distinctive, but only a little bit obnoxious, unlike the fully acrylic fans that have LEDs set right into the corners and the whole thing glows blue.
The only regret I have is that I'm out of places to stick more of these cool-looking fans. The ones I have right now do a more than adequate job of ventilating my case, but they do look pretty slick.
-Very good noise control
-Multiple 12v options
-Pretty decent cost
-Sheathed cables look very clean, slightly tacky for good cable management
-Not visible from space; lights not bright enough to give me skin cancer if I sit on the left side of my computer too long.
-No PWM. Voltage control necessary for manual speed control. When active, unfortunately this reduces light intensity at lower speeds. This makes me sad. Side effect is that it makes the computer look like it's breathing, if you set a bad fan speed hysteresis, which is slightly amusing at least.
PC build -
-cooled by Corsair H100i cooler, fans replaced with Thermaltake Riing because they look better and work quieter
Intel 535 SSD@240gb
2x WD 5400 mechanical @ 1tb
EVGA GTX-970 SSC
16gb RAM @ 1866mHz
Fractal R4 Define windowed case