Just wanted to add my experience to this thread.
My first GK41 ran quietly for 2 months in a clean, cool, well-ventilated area, with almost no load, just occasional web browsing. But then the fan started getting loud. It happened all the time, and it sounded like it was struggling, with kind of a groaning and grinding sound that changed at random. You could hear it throughout my house. If I lifted the front of the unit slightly, the sound would change a lot and get much worse. Clearly it was just a fan that was getting ready to die. Not a normal sound.
In a desktop PC, the fan might be something that users could replace, but the design of the GK41 does not support such repair. So I emailed support to ask about an exchange under warranty. At first, they didn't seem sympathetic, and they gave me a rather strange first offer, which I declined.
Next, I sent a video of the fan's shenanigans, and then they agreed to do a full exchange. They issued a FedEx RMA label so I could return the mini PC and get a warranty replacement in kind. They sent a new identical model to me very quickly. So far, after one month, it is running just fine. The fan is not completely silent, but it's not groaning or doing anything weird like the other one. Fingers crossed that it will continue for the entire warranty period and beyond.
I hope they work out the issue with their fan supplier. Maybe there's a bad batch, or just a defect rate that is higher than expected. Other than this one issue, the GK41 is a great little computer.