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Kaleido "300 dpi mono" is inferior to actual mono panel 300 dpi (without Kaleido's coloured dots) in sharpness, contrast, brightness (at same ambient light) and has coloured artefacts with certain 300 dpi content. It's physics.
The artefact issue is why there is an option on some devices to only render mono at 150 dpi. That makes it virtually artefact free, though still a slight "screen door" effect because the coloured dots deliberately don't fill the pixels, to improve brightness and contrast at expense of saturation.
So grayscale on Kaleido is only approximately 300 dpi at best and never as good as a regular mono 300 dpi panel.
I've seen a current Onyx model "face to face". My companion also remarked that it was a lot poorer than the Kobo Sage.
In ambient light the Kindle DXG (Pearl screen) is brighter and better contrast. It's 150 dpi.
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