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The product technology is still evolving rapidly, with the emergence of 4K video driving the quality of the images displayed.
Sony has the technology available for free, because as Binastro pointed out, these are built around coupled video recorders. The usability issues relate to sloppy software implementation arising from that, for example that FBI warnings about illegal video copying are shown each time the device is turned on.
Sony currently is struggling financially and as these glasses have been at best modest sellers there is doubt about when there will be another version.
However, it is an inexpensive development and a logical adjunct to Sony's push in digital imaging, so I'd be very hopeful that Sony will continue to move forward here.
I do believe those first generations are the best investments one could make.
Try to get one seconhand with the original box and stow it away for (future) grandchildren.
Currently they are not even worth the paper that is wrapped around it, but in the future it will be like the first edition Game Boy, the first cassette computer etc.