Hello, first post on the forum.
I have the hygge model s for about 3-4 months now, ridden about 3k kms.
The last bike I had was a velobuild so not my first Chinese frame.
I was Impressed with the frame quality not so much with the internal, not that I can spot an issue but it would be a great step up to make the frames with eps/latex.
The only issue I have encountered is as others have said is the top headset play. I removed the handlebar with the hoses attached, the spacers and the top bearing cover and I came to the conclusion that the top cover was slightly rubbing on the carbon lip of the bearing in the front. I filed/sanded the cover and checked that I could finally tighten it to have no play and fit a sheet of paper all around. It was no easy task with the four hoses in the headset assembly but I managed to make it work.
The test was a 400k brevet where the bike was flawless in all conditions(rain, wind, heat, cold, humidity).
The only "remaining" issue is a slight creaking from the rear wheel when climbing in the lowest gears 34-32 an 34-30 but I guess with a truing it will be ok as the wheel needs it(it has a bit of lateral run out).
Really happy overall for the price and quality, I would recommend it to anyone that likes to tinker a little bit with his/her bike and has a "good" mechanical understanding.