I use Tablet PD with Windows Journal. In addition to what you say, other advantages over chalk are the brightness, the colors, and the ability to instantly post

I use Tablet PD with Windows Journal. In addition to what you say, other advantages over chalk are the brightness, the colors, and the ability to instantly post the lecture online. Later I transcribe the lectures into text and just copy the illustrations. Plus, I don’t have to deal with chalk on my shoes, pants, and lungs!