Been playing with the trial and while it's cheap I'm in two minds about whether to buy it or wait until it's further developed.
Tried to make a pros/cons list too...
Pros:
It's responsive - not at all as laggy as ArtRage
The pens and crayons work fine for drawing
It feels fairly intuitive and easy to use (though I miss some hotkey functions of ArtRage like how to change the pen size or move the canvas)
You can zoom in (almost) indefinately without blur
Did I mention it's cheap?
Cons:
Very few brushes at the moment and none of them feel like "brushes". You have pencils, crayons, markers and such. All for drawing none for painting. Though painting works ok anyway I guess. Sort of.
No way to customise hot keys, brushes or pretty much anything.
The hotkeys don't work on European keyboards (and like I said they can't be customised either)
Limited support of formats (can import jpg and png, and export jpg, png and psd I think)
The website keeps reffering to their facebook page which is pretty much only covered in crap posts nothing to do with the program (things like "I'm up for some Mischief" and an image of a woman in underwear)
No layer blend modes. (So no painting greyscale to add colours later)
Pretty much all the lack of features are on their to-do list, but there's no saying how long it'll take. For the moment it's pretty much bare bones, except for that cool zoom function. But then again, it IS cheap...
This is what I played around with today. The bits done in greyscale went fairly smoothly while trying to paint with colour made me more aware that the brushes are either hard edged or very soft. It's hard to blend values or colours while also keeping sharp edges. Pretty much like ArtRage, there, I guess. (I suppose one would have to learn to use selections, though I didn't see a lasso tool or anything like a magic wand... Maybe I just missed them - it's hard to paint within the edges of something if all you can select are boxes. Minecraft for painting?)