The Sony has a very old implementation of ADE - the penalty of being the first device to adopt the format. It does not support full justification, nor does it support many of the more advanced ePub features. There is, however, every hope that Sony will update it in the not too distant future, given that the new PRS-900 has a much better implementation.
The Pocketbook supports all the ePub features, but is currently restricted to three text sizes, which really isn't enough. It is, however, only a few weeks old, and Pocketbook are very proactive in improving their firmware.
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