I can answer a few of the questions. I have the first one that came out.
1. Yes you can add a storage card.
2. As far as I know you can't share. It tracks your purchases and you can redownload if you need to but I believe it has to be to yours only. I don't have my book with me to look it up.
3. You can read in the light but not in the dark. I haven't noticed a glare.
4. I have no accessories other then the cover and chord. Dont think I need anything else. I just want to read.
5. You can order from amazon and look up definitions. I believe their are other wireless options though if I remember correctly. Im just not a techie so I have no need for it.
6. I have had a couple times where I could not connect but It seemed that if I moved it would pick up a signal.
7. not sure about that.
8. My friend had the newer one and the one thing I really liked was that you could change it so that it would read to you. Like if you are in the car. You can speed it up or slow it down. You can pick male or female to read to you. Kinda cool.

All in all. I enjoy it but I seem to default back to library books because they are free. lol
If I am traveling for work I take it because I only have to carry that instead of several heavy books. And if I finish one I can start another pretty quickly.

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"What lies behind us and what lies before us are tiny matters compared to what lies within us"
---Ralph Waldo Emerson---