Belated update... I got my Chuwi. Had some teething pains related to WiFi. Didn't realize this guy doesn't have a 5GHz radio, so I had to reconfigure my office WAP to broadcast 2.4 + 5GHz and enable bandwidth steering so other devices maintain 5GHz connectivity.
Now that that is sorted out, this is a darling little tablet. Screen isn't quite bright enough for my tastes, but it is otherwise punchy, sharp and colorful, with nice viewing angles. The touchscreen is very responsive as well.
The device is surprisingly lightweight due to the plastic casing, but it feels well put together. The size is pretty great, easily usable one handed and typing isn't too difficult. And W10 is way better for a tablet of this size than any previous Windows version.
I haven't done any heavy lifting in regards to app performance, but it seems snappy and gets out of its own way. The Android switching process is simple (desktop shortcut from within Windows causes a shutdown and reboot into Android; from Android, swipe down from the top-right corner of the status bar and tap OS Switch). I haven't spent much time in Android though, as it's not particularly noteworthy.
The #1 killer feature of this guy (besides price), for me, is the USB OTG support. It comes bundled with a Micro USB to USB female OTG adapter, meaning you can plugin any standard USB devices and Windows sees them as expected. I'm sure power will be an issue with anything bigger, like portable HDDs, but for most small peripherals it works great.
I have successfully tested (from within Windows) a 32GB thumb drive. a USB 3 hub/Gigabit Ethernet LAN adapter, and -- most excitingly -- a USB to serial adapter. So this + PuTTY == portable network troubleshooting toolkit.
I'll keep toying with it for a few days. I'll need a decent case/stand for it if I continue to use it. For now I rigged up a cardboard+foam+electrical tape desk stand. Paired with a Logitech K810 Bluetooth keyboard, it's working just fine.
Thanks for the tip. I think I can call it: Chuwi is the Archangel to Dell's Satanic Venue. Heck, it's even pure white vs Dell's morbid black. I think it's a $99 winner.