As I write this, the fans are either completely stopped or so slow that I cannot hear them. The fans can get a little "whooshy" under load, but nothing out of line with other Windows laptops, as far as I can tell.
I'm running under Windows profile (not one of the ASUS-specific ones in Armory Crate). I also limit the battery to 60%, since I'm mostly using it plugged-in, with external monitor and keyboard. A month ago, I upgraded RAM to 40 GB and added another 4 TB SSD (and cleaned the fans in the process, so it's even quieter). I think I'll keep this machine for a few more years...
That being said, I did experience occasional cursor stuttering, but mostly when the machine is under load (typically during Visual Studio build).