I've been following this team for a while. They put a lot of care into this app and they've come a long way in making it performant and easy on the eyes. Updated recently to support iPad Pro and Pencil. Also, they started an interesting IAP model with this version. The new update is free with major new features behind IAPs. They state that next year, with the next major release, this year's features will be free. So, you can either download this year's features next year for free, or pay to have them this year. Solid team and product. Support 'em.

That looks amazing!

Works great in tandem with Blender!