Okay, user report now some weeks later. I got myself fullscreen iPdf installed, and actually used the device regulary.
After I got used to what the iLiad can't do well, I now see much better what it *can* do well. Everytime I take into my hands I'm again and again astonished of the display quality. I got myself the WACOM pen, so using it as Notepad is much more fun now than with the stylus toothpick. The train with over-head lights turned out to be actually the most terrible reading condition of all. Everywhere else I have no problem positioning myself of my lights in a way they don't reflect in the screen. I got now a thick paper book to read (>600 pages), and I'm luckily enough to have got PDFs from it! So now I gladly take the iLiad everytime with me to continue reading that, since alone this book weigths at least 3 or 4 times as much as the iLiad

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Also I like the attention I get in university classes with the device, since everyone wants to hold it once