Thanks for the feedback so far - very helpful.

A couple of further questions:

1) when reading a pdf in edge e-ink side, does the machine 'convert' it, so that the pdf re-flows, and that's why annotations only display at a particular zoom level?

2) And following on, I'm still rather confused about whether e-ink markups on pdfs are specific to the Edge, or are universally viewable on any machine with a pdf reader? Is it possible for someone to markup a pdf - using hand writing, coloured highlighting and typed comments - and make it available to download so I can actually check how it looks in a standard pdf reader on a pc. How a marked up pdf 'exports' is something I'm really interested in working out if the Edge is going to be suitable for my needs.

thanks