The fan control is a big deal for me. I have a Maximus Extreme IX at the moment and the fan control is ok, but not quite where I want it to be. Loading a profile doesn't actually work properly and I have a fan that spins up and down fast despite manually setting long times and a different profile. Sometimes the fans don't follow the curve, you can see the orange dot indicating temp/fan speed is sometimes nowhere near the fan curve. I've been on Asus for a long time now so I'm keen to try something else in the hope it works better for fans. However it's probably fair to say that if I spent more time on it, and did it in BIOS rather than AI Suite I might have got somewhere.
This new build I'm intending running my rad fans off the water temperature, so I'll fire a plug/probe into the res and as confirmed earlier in the thread the Master board will be able to control it based on that. I'll also be able to run my pump based on CPU temps (maybe GPU temps?) and a single case fan based on VRM or board temps.