I /just/ got mine in the mail (i7, 16GB, WQHD non-touch, non-IR webcam, 1TB SSD). My comparison is a 15" Macbook Pro Retina (2014). Some initial impressions:
Build quality is good, it feels solid yet light. Minor nitpick is that the screen doesn't retain its position well if you hold it in your hand. I'm not known to be gentle with my equipment, and it gets thrown in bags, used in the freezing cold, etc; it's a consumer device with limited life span, I know that going in. The trackpad is one of the best I've seen on a Windows laptop, but still no match for the Macbook (although could be my muscle memory). Also I love the aesthetics of the thing, it looks and feels professional and doesn't have any of the frills "gaming" stuff usually has. There was only one Intel sticker, which I managed to peel off without residue (what's up with those stickers...). The white backlit keyboard is a nice touch, which is overall amazing to type on. I still can't deal with Windows though (it just feels so sloooow), but I'm reluctant to install Linux right now because of a bug in the trackpad drivers (it becomes unresponsive) if you have the NFC option (which I do). I'll wait a couple more months for that to get sorted out. Right now I'm running Linux (Ubuntu 17.10) in VMWare Workstation 14, but that's also very slow (noticeable input lag when typing or dragging windows). But that's all software, I'm sure that will become better over time. The bad though: the audio quality is awful, I mean a 2014 Macbook Pro is bad ... but this is a whole new level. The case even vibrates/resonates with the volume turned up a little bit, and the whole thing sounds like a tin can. Also it gets REALLY hot, as in uncomfortable to use on my lap. The fan curves probably could also use some tuning, it goes on and off often, which I dislike over a continuous sound and would probably help the thermals too. Although, I haven't done any benchmarks yet to check for throttling. I was hoping it would replace my aging Macbook, but it'll probably end up in a drawer until I squeeze the last bit of life out of a 2014 machine, which is in my opinion still the best laptop ever build. The new Macbooks are not really an option (even if I could justify the ridiculous costs) due to lack of USB type A/B ports (which I need for astrophotography), and the annoying sound of the keyboard.