I have had mine for about two and a half months. I was very wary as well after reading the very many comments about quality control.
I would recommend to anyone seriously interested to purchase it from the Microsoft Store as opposed to the Dell website. I believe they quality control the units themselves as they do fresh re-installs of the OS and strip them from all the bloatware from Dell. I expressed my concerns to the Microsoft representative and he said that in two months of selling it they had no returns (obviously he could have been making it up, but still)... Whereas the Dell website is full of complaints. Also, the MS units ship from Germany as opposed to China, so they arrive very quickly (mine arrived in 3 days).
I must say that after installing all the driver updates I can't think of any major issues that would make me want to return it. The machine is fast, powerful and I can play 2016 games on it (Rise of the Tomb Raider at 1080p). It runs a lot quieter and cooler than every other laptop I have had. I don't recall having any blue screen of death, it probably just froze once. The audio is not terrible after installing the new drivers, it's quite powerful, the annoying thing is that the speakers point downward and therefore the sound is often muffled by your lap. The main nuisance I found was the webcam, the positioning of it makes it very very weird to video call people as they are seeing up your nose, and you need to be looking on the bottom left corner of the screen to feel like you are making eye contact. Terrible. Otherwise I really love the machine and I do believe that at the moment it is one of the very few light and portable powerhouses that are sleek looking while also being extra powerful.