I love the hardware and they provide you root access. I really didn't like their software for document sync, but I installed syncthing and it works like a charm. Next step for me is to replace their document reader.

I would second this, its pricey at $600 (on sale for $500) but it does read well. My first 'ereader' type device was the iRex Iliad and it had similar features. I had really hoped that Plastic Logic would meet the need for an affordable and durable e-ink screen but they augured into the ground[1] based on their own hubris.

[1] Yes, there is a shell out there that owns the rights but the original effort/team was killed by shooting too high and flaming out.

Looks neat, but $500? Yikes.