I recently got an Inkpad 3 but I haven't tested the audio functionality, as there are better options - try listening to TTS with smartphone app Moon Reader plus.
Haven't needed to use email-to-PB, as the Dropbox functionality works seamlessly with full 2-way sync
Reflowing 2 column scientific PDF articles are OK to read, but reading newspaper PDF's is a chore with their varying layout.
You should try installing the KOreader application, it has a myriad of options for PDF, many more so than the native reader.
Once I accepted the limitations of e-ink, I've been enjoying the experience. Response time is slow by it's nature, and the applications don't have the polish of top rated mobile apps, but that's to be expected.
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