Everything works fine. I've experienced no overheating, network is stable, all the USB bits work, it docks and undocks without issue, the web cam works, audio works, it sleeps, hibernates and wakes up fine. Fans aren't very loud and I've only ever heard them spin up when compiling (I would say the full speed fans on the 5550 are about as loud as full speed fans on a 2016 Macbook Pro). The large touchpad works well enough. The 4k screen is OK, and matte, which I consider a bonus. The keyboard is average, certainly not the worst laptop keyboard I've ever used, but far from the best.
However, I wouldn't buy one for myself. Simply because of how flexible it is. It is nearly unusable when sat on anything but a hard flat surface. It's like the designers never even tested it as a LAPtop. Tiny, imperceptible flexes, or even just more pressure on one side than the other and the touchpad generates clicks.
Also, a USB-A port would have been way more useful than an SD-card slot.