Keep in mind RMSDK version when thinking about previewing. ADE 1.7 uses a much older version of RMSDK - this will be equivalent to what the older Sony Readers (or Nook Classic) is using. ADE 1.8 (in labs.adobe.com) is using the current version of RMSDK. One of the big changes between the two versions is that a new text rendering engine was added, and the layout engine was tweaked accordingly (hyphenation was added for instance). For most content you will get a noticeable difference in results (and for some content there will be a dramatic difference).
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