SAI is a vector based program, and comes with a stabilization tool so any line art produced always looks extremely crisp and sharp. It has a wide variety of brushes and anyone can mimic just about any kind of painting style. The brushes will blend colors together and give textures that are brilliant. The program is quick to load and does not take a lot of ram, unlike many other paint programs. It also has quite a few of the same layer features Photoshop has and a somewhat similar interface. It has a color wheel which is a wonderful feature. It also has the ability to save in a Photoshop format so you can import all your work to Photoshop and add to it there or import Photoshop files to it. Just keep in mind it will convert any text to a regular layer as there are no text tools in the program.

-The software interface is very intuitive. Is easy to deduce how to use every tool. - Be allowed to change the tool settings in a huge variety of combinations brings a lot of possibilities. You can play freely with every texture. - BLENDING

The easy-to-use once it's on the screen, the lineart tool which I'll always be a fan of and mostly, what had me using it even when there were some other good options out there: The water tool. That thing alone made me a SAI dependent for a while, I admit.