Despite the hype I dont think many peopl actally produced anything with Brushes.
Anyway, as I'm working through the apps I have I gave it a second look, but this time, on an iPad air, with it's far larger retina screen... and you know what it's not that bad.
It does exactly whatit says in the name, and allows you to create brushes, and as long as you bear that in mind, and use it to paint, with a brush and don't try and draw its fine.
The brush settings are very comprehensive, and it all works quite nicely, there is a bit a gesture sensitivity if you try to do small close strokes, which it interprets as wanting to use the colour picker (the opposite of the problem with Autodesk mobile sketchbook X)
It has multiple layer support,can import and export to a folder ondropbox as jpg, png, native brushes format OR psd, which is useful.
It automatically records the drawing process and turns it into a video clip.
Anyway, today's challenge theme was 'moon' which can't be right... that's no moon...