I am a medical illustrator, CraigL. Have loved my Cintiq13, which changed the way work is done, but itis now 6 yo and fading-- it lost its highest screen rez twice, so icons are enlarging, etc. Its also tethered to the box with wires. The screen has a brighter glow at the bottom, so its no longer color-true.
So I got the pencil and ipad pro *because of Astropad.
I had expected *Apple to address this when iPadPro came out last year. Nah. While ThirdParty is often sketchy at this level, AP looked "pretty solid."
Watched a demo vid online, then tried Pencil at the iStore and asked Apple Store sales staff, who just looked at me, dumb-founded. Of course they said "it doesn't do that." When I showed it, Sales acted like it was a standard feature of the ipad. HA. Took a leap. Wow!
Like it so far(!) tho it has quirks. Yes, it works; no, its not a Cintiq---- but for my use, its quite good! I have had a few issues, which resolved on power-cycling, tho I have yet to use it over USB-- does it work over (USB-C) Thunderbolt?