Tweaknews.net posted a review on the Nanoxia Silent Case Fans
A quote from the article:
Nanoxia Silent Case Fans Review
All in all, despite the one DOA fan these fans performed very well. The noise levels were decent and the fan controllers provided with each unit was a nice touch. I have had four of these fans running in my main PC for almost a month now and I honestly couldn't be happier with a fan.
Nanoxia Silent Case Fans Review