Thanks again. I am very tempted - I have loads of PDFs I need to plough through and as I've said I don't find reading on my tablet using Acrobat all that manageable (hard to explain why - I've got so used to eink and for me it's the only way to read + my eyesight isn't as durable as it usd to be).
The X is really quite expensive (£385 on Amazon) and that holds me back a bit.
What is KOreader? Is that a native app on the Pocketbook? (It's not on my Touch Lux but it may be on the Pro ...)