Could I point out that it is apparently working, and that the nature of being plastic based rather than rigid and class protected has major manufacturing consequences.
A flexible material is inherently easier to produce quickly. Plastics are amongst the easiest materials to deal with in any manufacturing process.
The most expensive part may well be the processing component. A4 with current technology (glass and rigid) would have to become much heavier proportionally as the glass would have to be thicker (for rigidity) to compensate for the fragility of its greater area (I would assume, I would also guess that glass would become proportionally a greater components of overall weight even it became no thicker - there is just more of it).
I would suggest that even if it had a very slow refresh rate, that it may be cheap enough to have two page combinations. Anyhow, it looks good to me at least.
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