You have to wonder why someone did not think of this form factor sooner. I have the original X4 and have been enjoying it a lot. My Kobo mostly lies unused because I do most of my reading in bed and the X4, even with a clip-on light, is so much easier on the wrists.

Dual core Arm CPUs, Android etc used by mainstream readers are a serious waste of resources. A microcontroller paired with the SD card is more than enough. And CrossPoint is a gem! The list of pros is long and the device recommends itself. But there is one con that you must watch out for:

The screen is delicate.

I love cases but hate screen protectors, and tend to use my devices with care. So it has worked out fairly well for me the past few months. But you might have a different experience.