Linux

Impressive tbh. I read at least 30min per day in bed with background lighting on and make it for more than 2 month usually (with an Era colour, though).

The verse of my kid has not been recharged ever since they got it in August and they use it for hours each weekend and approx.1 per weekday - with zero light on,though.

Another point for Pocketbook (not relevant for you,but maybe someone else): It works effortlessly with calibre web - unlike Tolinos, Kindles and some Kobos(even those have a better integration when they work).

And at least in Europe the "onleihe" (digital public library) system works extremly well on them. Around 90% of our books are from various onleihe librarys. (Unlike Tolino and some Kobos they support multiple onleihe accounts).(BTW: There are ways to get accounts for some of these - that have extensive english sections) even if you don't live there)

Service wise: I had issues with initial delivery and they were solid (even though it wasn't their fault).

Data security wise we looked into the traffic a hit and beside the usual shop traffic (recommendations,etc.) it seems to not do much,but we have it in an isolated network that only allows access to Onleihe, Calibre Web and a RSS aggregator anyway.

Can't complain at all. Very happy with them, only complaints I have so far is the not as Kobo calibre Web integration (not their fault) and the fact that their OS is not as open as I wish.

I have a verse and haven't charged it in probably 2 months. Granted I don't use it heavily, mostly a bit at bedtime, but it seems to sip power pretty well.