My 16" (2.4 / 5500M (8GB) / 64 GB / 4 TB) is here, and it's extremely fast, with no immediately apparent build quality issues. The keyboard is great - best laptop keyboard I've used in years (trying to remember how it compares to pre-chicklet ThinkPads).
I posted a whole bunch of benchmarks in the benchmark thread - but it is within about 10% of a base iMac Pro in everything I have thrown at it. It's actually slightly faster than the fastest trash can Mac Pro in just about every task (going by published benchmarks on the iMac Pro and Mac Pro). The only Macs that can outrun it are the top CPU upgrade on the iMac, various versions of the iMac Pro, and of course the new Mac Pro when it arrives.
It is very price/performance competitive with top-end PC laptops, and going through the Geekbench 5 Browser for everything that uses the i9-9980HK, it's slightly faster than the Dell XPS 15/ Precision 5540 twins, significantly faster than the ZenBook Pro Duo and the HP Studio x360, somewhat slower than the heavy Dell Precision 7540 and 7740 workstations (and probably their Lenovo and HP equivalents, but those weren't in the Geekbench browser) and significantly slower than big 17" gaming laptops, many of which are probably overclocked.
If you remember what this thing is (a thin-and-light mobile workstation), it's a real beauty. If a thin and light mobile workstation meets your needs, it's a very good choice. If you need the extra 10% in performance (and somewhat more than that in GPU performance with certain options), the heavy mobile workstations are out there from a variety of PC vendors.