To be clear, I wasn’t unhappy with the Nexus (it worked very well) – someone on AVS was having trouble getting an AC PWM fan working on the board figured it was worth a couple bucks to see if PWM fans were worth it (yes).
I’m not sure that it would be a good idea to mix different size/v fans on the same line so I didn’t share the PWM, it’s just used for the HSF.