I recently switched up to a DXG from a K3. They both have the same e-ink Pearl Screen. The biggest difference is the firmware. It's possible the DX could get a firmware update but I wouldn't bet on it. Other than the browser there isn't a huge difference with the firmware. The DX has a sensor to autorotate when you rotate to landscape. In my opinion the DX has better build quality and is more sturdy than the all plastic K3. A pic comparing the screens. I don't know if you can tell from the picture but my DX actually had better contrast.
