Using the PWM hub lets them idle slow and quiet until system get hot, needs more cooling / air and then the speed up. Works very well.Ive found the fans to be really really good, even on full tilt they arent hideously loud, obviously you can hear them but its not defeaning and if you have a headset on you dont notice, not that i ever run them full tilt though, only if im purposely pushing them to max for testing.
Shinobi XL is a good case. I'm surprised how close in size it is to Enthoo LuxeMarch, not too far off then. Think i can live with the shinobi xl a bit longer.
I removed the center panel in lower cover on my Enthoo Primo, simple to do by removing a few screws.