Just like the subject says, looking to upgrade my fans, and yes, I'm going with RGB. I have a corsair specific connector for a commander pro on my board, so I'm going to use that, and I don't like mixing up brands too much to save on overcomplicating my setup. That being said, I'm torn between the ML or QL models of RGB fans. Anyone have them, or have had them? Just looking for some input. I am going with 140mm to maximize silent operation, everything else in my case is 140mm or larger (I have 2 200mm fans on the front of my rig).

Thanks in advance for any advice or input you could offer!

From Corsair's specs they look pretty similar airflow and static pressure wise.  The ML has a nicer bearing but the QL has better RGB.

RainStryke
The QL series uses hydraulic bearings which is great but the ML series uses magnetic bearings with no touching parts so it's quieter and it's going to last you longer. The QL series comes with a 2 year warranty while the ML series comes with a 5 year warranty. The QL series focus is on RGB though, it's not really focused on performance. I would recommend the ML140 PRO RGB's since your focus seems to be quiet and RGB.
 
 
 
 

Thank you so much!!! I will say that yes, my primary focus is quiet. RGB is icing on the cake, so to speak. I really appreciate the advice, I will likely be going ML 140s due to your advice here. Thanks again!