Agree the Voyage was a great device, the best flush glass screen (better screen than the Oasis).
But some e-readers with sunken screen are at least on a par with the Voyage IMO.
The hardware design isn't as polished, but My Poke Pro screen seems sharper/crisper to me for reading. Software has pros and cons... better than Kindle if you're an enthusiast willing to spend time customising, but not as simple to use for regular users.
They've improved their rendering modes recently. The stock fonts aren't as good as on the Kindle, but it's easy to install
https://www.fontsquirrel.com/fonts/literata-book which I prefer to the standard Kindle typefaces.
The bigger Onyx screens with flush glass aren't as sharp.