Ok. I gotta say, SAI got me hooked. Though not so much on the coloring aspect as I have some few issue with it. But what turn me on is the lining part. It is so much easier than photoshop! Click on curve tool and start lining (preferably with mouse}. There's even an option to adjust the lining pressure to get sharp edge. If you are not satisfy with the curve, fraid not, just click on the edit button and re-adjust it to your liking. Unlike photoshop whereby to line an art, you have to click on pen tool, line it then right click to select "stroke" just to find that you forgot to set the brush size and hardness. And after stroking, it's a hassle