WS vs 4:3
I find WS too big if it's 1600 lines.
Many WS laptops and screens lack height resolution. 1200 vs 768, 1024 or 1080 makes a big difference.
I welcome it being a 4:3. Especially if you want a 2nd screen.
This is an interactive drawing board. When did you ever see a Wide Screen Drawing board?
The advantage of a light pen is of course anti-aliasing. Inherently a light pen works at lower than screen resolution and a touch panel with orientation and pressure stylus can work at higher resolution.
I think this is excellent for serious Artists, slightly less useful for regular CAD and not a good idea at all for people doing only occasional photo editing and no drawing/CAD.
It's a nice tool for professionals in addition to a regular screen, even maybe an addon to serious laptop.