1) If you need more than 8 - 10 hours of battery life with wifi and the LCD screen off, you might want to consider getting a second battery. It would be difficult to imagine a reasonable situation where you'd need more than 2 full battery uses before recharging. +$60, I think? (Note: this refers to the larger edge only. the Pocket Edge has a smaller battery and is non-removable)
2) I think the consensus is there's not another e-reader out in the market today that handles PDF better. I use more PDFs than ebooks, so this was important to me. That's not to say that the edge can't get better in how it handles pdfs, just that you'd be hard pressed to find a machine that compares other than a full-blown tablet PC.
3) Some people use a program called Calibre to manage all their e-reader content (ePub, PDF, paid and free sources of books) and I believe this program can convert material you own (so I would think that includes Kindle books) into a format that can be used on the e-ink side. I know the mobileread.com forum has an entire forum section devoted to Calibre. But there's no native support for it on the edge. So that may be worth checking out if you really prefer to have a kindle book on the e-ink side instead of just using the Kindle for Android app on the LCD side.
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