I've looked at this device and I wonder how good the layout engine is. Screenshots never show text with any hyphenation going on which makes me wonder if it even supports hyphenation.

One of the images on the Amazon page for the reader has somebody holding one beside their laptop and if you look at the screen, it looks terrible. There are even words jammed together ("would be most suitable forthe job").

I love that it has physical buttons though. My reader is the Kindle Oasis and the buttons are one of my favorite features of the device. The Oasis layout engine and typography are both pretty good and I wonder if the X4 would end up feeling like a big downgrade.

The layout engine is limited. It does flow text quite well, but when I had mine (the screen broke a few months ago) I was working on adding more features to the rendering engine.

It's easy to write a HTML & CSS layout engine to support most of the epub spec, but hard to do it well on such a constrained chip. Even things like nested lists and inline code snippets are a challenge.

The alternative firmwares give you a lot more options in this, stock is OK in layout

Custom firmwares support hyphenation