I am almost in the same boat.... I used to do more photo editing and drawing at one point, and had a Wacom tablet for that. I don't do enough anymore to warrant a Wacom and I can meet my needs on the Pad, but... this will allow my simple sketching and editing to be done on the larger screen. If the pricing is good, I am in. (I tried the other Astropad apps in the past, but found, for me, just having a Wacom tablet of just using an iPad app for drawing or editing to be a better choice over mirroring the Mac screen to the iPad).This app is proof that I am not creative enough to make an original concept.
This is sooooo out there that I scratched my head as to how useful could it be worldwide.