Just watched a video of someone drawing in SAI.

WANT.

-PRETTY VECTOR LINES AND FILLS. I cannot go on about this enough.

-Flip, rotate, and zoom your drawing viewpoint, without ever changing the actual orientation of your canvas.

-Exports to .psd.

-Scratchpad.

-Masking and clipping.

-Starts up in seconds.

-5 megabytes. FIVE. MEGABYTES. WHAAAAAT.