addendum
for potential M90 buyers:
The PDF support isn't really on par, for I have had tons of academic books scanned as PDF and page turning is forever slow, especially with graphs involved. Converted thru OCR improves it a bit, but for complex graphs, such as some camera service manuals, slow.... Not sure it's a firmware problem or hardware limitation of the device.
Some of my Chinese PDF textbook is sooooo slow that turning page requires 1 min. Such as <dreams of red chamber> as it's written vertically instead of horizontally.
dictionary is a joke as 1.5.1.20110729, annotation... forget about it, the firmware is nontheless very buggy as its current status, despite being developed for at least a year. I would say wait for other company releases a pearl screen, as Onyx certainly doesn't have the technical advances developing a proper firmware (it might have cheaper labor for its based in China)
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