The Onyx Boox Note is a 10.3 inch digital note taking device, but not everyone is going to freehand draw or handwrite notes. Some people are going to be editing PDF files for their business, classwork or personal use.
PDF editing is quite different than the note taking app, there are a few things you need to know about. Pressure sensitivity is incompatible with PDF files, so you will have to select the correct pen size for your needs. Also, there are a number of sub-menus that turn into toolbars that provide more advanced features such as split screen view in landscape mode.