If you can use a regular monitor with mental hassle they're probably isn't a good reason to consider a product like this. There is some niche appeal to general tech hobbyists who find it cool, and also to the minimalist-yet-buys-expensive-stuff-regularly crowd. Perhaps there are also some use cases like writing a book where it can provide a wonderful experience.
On the other hand a portion of the population has an absolutely horrible time using backlit monitors. Simply put, they will tolerate just about anything to have a usable alternative that doesn't cause migraines and eye strain. I'm getting there, and I can confirm it's a ridiculous experience. Completely destroyed my workflow, to the point where I was very seriously considering digging up my old t60p ThinkPad from over a decade ago because it had a special LCD panel that looked like paper.
On the other hand a portion of the population has an absolutely horrible time using backlit monitors. Simply put, they will tolerate just about anything to have a usable alternative that doesn't cause migraines and eye strain. I'm getting there, and I can confirm it's a ridiculous experience. Completely destroyed my workflow, to the point where I was very seriously considering digging up my old t60p ThinkPad from over a decade ago because it had a special LCD panel that looked like paper.