BurnOutPC.com has posted a review on the NF-S12 and NF-R8 Fans from Noctua

I was familiar with Noctua in the past, but never reviewed anything from them. After looking at these fans, I can conclude that they take great care of maintaining a high quality on their products. These fans not only look great, but they also live up their expectations at being silent, yet produce a fair amount of cfm. If you find these fans to be to noisy, which i doubt btw. You can always plug in the resistor cable and decrease the fan speed making it even more silent. Overall three really good contenders when it comes to looking for new silent fans for your rig.

Noctua NF-S12 & NF-R8 Review