After spending some time drawing with it. AstroPad is very good.
Here are a few things that I am impressed with:
It does a great job matching the angle of the Apple Pencil. Pressure sensitivity works great too.
I was even able to create a marker brush in Illustrator CC that uses the flat shading side of the Pencil, but also maintained a fine point tip when the pencil was used upright. And seeing it with no lag in drawing in Illustrator CC and Photoshop CC worked equally well.
I also noticed a big improvement having both the host Mac and the iPad Pro on 5 Ghz WiFi. I have not tested Manual WiFi yet. That seems to be harder to configure with WiFi when one of the devices wants to jump onto its regular network.
After completing my first sketch using AstroPad, the Pixel drawing was barely noticeable. New areas are drawn very precisely. And the screen keeps up with the Apple Pencil.
I've used the Wacom Creative Stylus 1 and 2 and both create a drawing delay behind the artist. Creative Stylus 2 was worse and the delay was so bad it caused a severe distortion even when taking notes with it at NCDevCon. (And this was with native iPad apps, not Astropad).
Thanks for the quick reply. I'm sold and look forward to trying out future versions.