I have had an Onyx T68, C67 and now the Nova (non-Pro); I have also had the Boyue T62, T63 and now the Likebook Mars. My experiences have been similar to yours. Let me share some comments and some comparisons.
The Likebook Mars is the most stable Boyue device I have had thus far. That said, it still gives me trouble when I want to use the Nook app on it. The Nook app usually crashes; it will work on occasion. The light is a pale orange and is adjustable, and can be turned down to very low levels. On one thread, some other users report that their Mars has a darker orange light. The Mars' main advantage vs. the Nova is that it has an SD card slot. With Android 6, you can format the SD card as internal storage. I have a 128 GB card in mine, with no issues. Battery life is very good with WiFi off; so-so with WiFi on. Contrast is quite good. The native reader app handles pdfs reasonably well, but not great. I wouldn't use the native app for reading anything, really. It's acceptable, but not that great overall. Performance is good, compared to older Boyue devices. But once I bought my Nova, I honestly don't use my Mars very much.
The Onyx Nova is a little better than the Likebook Mars in almost every way. The Nova does NOT have an SD card slot, though; but it does have more internal storage (32 gb, compared to 16 gb for the Mars). The Nova also has a pale orange light that can be turned down low. It's also easier with the Nova to adjust the mix of warm and cold light to your liking. Performance is better on the Nova; apps load faster, pages turn more smoothly. NeoReader 3.0 is excellent with pdfs, and better than the Boyue reader app with ePubs and other formats. Contrast is very good with the Nova. The Nova will refresh itself on scrolling third-party apps as well as apps that turn pages; the Mars only refreshes automatically with the latter. Battery life is similar to the Mars. The Nova has an optimize menu that you access by long pressing an app icon. This allows you to adjust third party apps to look better and run better on e-Ink, as needed. You will need to use this to run Kindle smoothly on the Nova.
Screen sensitivity seems good on both devices. I haven't tried writing on either device, so I can't tell you anything about that.
Please let me know if you have any other questions.
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