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I get 10-12 hours per charge on mine, less if I use the pen to make a lot of notes while reading. It recharges fairly quickly, but it's fairly awkward to use while plugged in.
I tried your sample document and I thought it was fairly readable in portrait mode, though the text was a bit small (try photocopying at 50% or whatever gets you A5 size (half-sheet) and see what you think). I also tried the landscape mode, but with a two-column page layout, I personally find the landscape display to be really annoying. I read journal articles on mine in regular portrait mode and it works well for me. The display dpi is high enough that the formulae, tables, diagrams, etc. are clear enough for me to read them easily.
That being said, if you don't think you'll use the touchscreen, e.g. to make notes on your PDF files, you'll be paying a lot for the iLiad with not a lot of extra functionality over something like the Sony Reader or the upcoming Bookeen model. If you'll use the stylus and/or wireless functions, it could be worth it for you. I like mine a lot, but I bought it used and paid less than full price for it.
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