What are some alternatives?
When comparing The Paper Pen and Norton Point, you can also consider the following products
PaintCube - Web-based 3D painting software
ZUNGLE - A pair of sunglasses with built in bone conduction speakers.
Massless Pen - A pen for drawing in virtual reality
Tens - The Real Life Photo Filter (sunglasses)
LIX 3D Print Pen - Draw in 3D
Shades - Shades is a FREE utility for controlling the brightness of your screen.