I like it's lightness and the simplicity of the tools, I especially like the color blending capabilities which leave an oil paint feeling when using the tools.

Paint Tool SAI is a painting tool. Mainly for drawing and painting, and not editing. Paint Tool SAI experience is just like the real pen and paper experience. the drawing is fluid and if you use pen tablet, you can customize the speed of your pointer so you can make it more accurate just like using real pen. You can customize brushes, see other people setting or make your own. brushes setting is very complex yet simple. you can even customize the effect of your pressure pen, is it more size of your brush, or even the thickness of your paint. You can even have layers just like other photo editing program. what makes it more to liking is that you can have two kinds of layer. Vector layer and normal layer. for mouse user is easier to use vector layer, because the vector making is very simple to use, you can even add pressure pen effect for the lines that you make in vector layer. You can even save the file in various format, such as .PSD or .AI.

Being an artist myself, I have spent time searching for a decent art program that can provide the tools that I need to create; and Paint Tool Sai does that extremely well. A program with smooth lines, intricate detail, and vector artwork is great for any digital designer - especially those interested in manga art, but also other types of styles as well. Other things which are beneficial from using this art program over others include it's price. Incredibly affordable, with its 31 day free trial that accompanies the download - just to give you a taste of its power. It also supports pressure sensitivity, which is something nearly all modern digital artists need to get the strokes they desire. Also, works well with touch screen computers.