Just upgraded from a MBP 2017 "best" to this specific configuration and couldn't be happier. I use the machine for work during the day, and for personal use during nights and weekends. I have loads of TB3 and USB devices, including an UAD Apollo and musical equipment, from my previous Mac. Everything works just fine, including Windows 10.
1. A real keyboard, OMG is the MBP one an annoying piece of crap compared to the Lenovo. The pressure required could be a bit less IMO
2. Seven standard Phillips screws at the back and you are in. Took me 5 mins to upgrade to 32 Gb and an additional 1 To Samsung 970 EVO. The stock 512 Gb Samsung one has performance very close to the 512 Gb in the MBP, in fact I suspect it's the same part
3. The screen is *very good* and the overall performance of the machine is excellent. I just wished they would have put a faster GPU in there, but I'll probably get an eGPU at some point with a RTX 2080 Ti or similar
4. The Lenovo "experience" - e.g. Lenovo Vantage software, support and web site is good and professional
5. The trackpad and point are just fine, none of that stupidly over-sized Mac trackpad and touchbar nonsense. The fingerprint scanner works
6. The build quality is just fine, the weight very similar and the style understated and professional (you will not be rocking an MSI or Razer gaming LED gore fest)
7. The Fn key on the left is dumb, but you can invert it with the Ctrl one in "Vantage" and just forget about it in a day or two
8. Two TB3 ports on a Windows machine !
9. The 135W charger is very compact and charges the machine much faster than the 85W MagSafe on the Mac
10. All my software works just fine under Windows 10
Price was not really a factor for me, but the price is "correct" and even decent compared to the MBP. I am (was) the core customer segment for Apple, and they should be very worried. IMO if you buy a MBP over this Lenovo, especially with the current keyboard and all the Apple shenanigans and f*ck up of the post-Jobs era, you are seriously delusional.
Hope this quick feedback helps any potential buyer sitting on the fence.