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The libra needs an extra 10mm, less than 1/2", of width.
I have the Libra and the Original H2O.
In smallest, cheapest, simplest sleep covers at fattest points:
H2O: 135 x 181 x 17 mm (tapered to 15 mm at both sides)
Libra: 149 x 161 x 14 mm (mostly 13mm, but twists at one edge)
You'd not want to have them without a cover as the replacement screen for the H2O is about x2 the price of 7" LCD Tablet.
So the Libra 300 dpi 7" wider model is about 2mm slimmer, 15mm wider, 20mm shorter than the original H2O 265 dpi 6.8" model, replaced by Mk1 and Mk2 revised versions with no SD card slot.
In ambient light:
The original H2O is about the brightest white of any ereader I've seen. The Libra is almost identical to the PW3 in screen whiteness and sharpness, but 7" rather than 6" with nice page buttons you can ignore.
The buttons are not really why the Libra is wider, the electronics is at the side so the thickness is limited by the aluminium cast chassis (to protect screen) and the thickness of the lithium cell. No doubt the screen whiteness is highest on the original H2O as there is no touch layer. The PW3 and Libra have a capacitive touch layer.
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