If you don't need an ebook gadget right now, Boox is about to release the Boox Picco as a direct competitor to this. It's in between the X3 and X4 in size, but

If you don't need an ebook gadget right now, Boox is about to release the Boox Picco as a direct competitor to this. It's in between the X3 and X4 in size, but has a front-lit and potentially higher resolution screen. I have an X4 Pro (219 ppi) and I use 14pt font because letter widths are pretty uneven at 12pt and on a screen this small I wish I could use my preferred tiny font size. Other than that, it's great.