I was a customer for over ten years. Spent well over ten thousand dollars there in books and other items. But for the last several years their customer support has declined, their partner businesses engage in numerous disreputable practices that mirror the abuses at ebay, their manipulation of book rankings on so-called adult material (gay), and they seem intent on monopolizing the epublishing trade. I closed my account and won't look back.
Yes, the Kindle-DX looks like a nice machine. But what one gives up in basic rights as a reader is more than enough to keep me buying used books printed on dead trees for some time. And I can always scan the books I buy to load on an ereader with less virulent DRM limitations and corporate controls. I own an iRex iLiad, that while not the best manufacturer, at least they offer a free Linux development environment to download and install. Users are hacking new software on that platform. Does anyone here expect Amazon to allow that? Not me.
BTW: closing my account with Amazon took several phone calls and numerous transfers from one department to the next. They don't like it when customers attempt to leave them and make the process as difficult as possible. Yet another reason to never give them my money again.