My T62 arrived a couple of days ago. It's the T62D, so the newer version. I really like it. I believe it is a Carta screen. Compared to my Aura HD, the screen has a noticeable cream colored background rather than a whitish-grey, and the contrast appears to be a little higher.
Neither of the included readers handled my sideloaded preferred font correctly. I added all four families of Linux Libertine, and both seemed a little confused by that. It might be a naming issue, but I didn't pursue figuring it out. I installed Moon+ Pro and AIReader, and they both handled the fonts correctly. I set the refresh to "Always" on AIReader, and that seems to keep the text clean.
My one issue right now is with the light. It works great...a little too great. I want to decrease the minimum brightness, or figure out how to change the brightness adjustment steps. I fiddled around some with the files in /sys/class/backlight/rk28_bl, but haven't really made any progress yet.
I can't really comment on the battery life, since I've been fiddling around with getting stuff set up 'just so' too much to judge. Like others, I installed Greenify and a CPU manager after rooting (though I didn't use SetCPU, just because there was another one I'd used extensively before). No issues with it using battery while idle, so I expect the battery life will be fine once I stop fiddling around and just use it as an ereader.
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