The niche I think this product is really targeting is higher academics (e.g. PhD-level) where people read hundreds of pages of PDFs every week. It’s a fairly small niche, but it sounds like it could fill it really well.
PDFs display really well on 7 and 10-inch tablets, but reading on a backlight LED can be taxing after hours and hours of reading.
I could see myself getting one of these for school.