I'm still using my Kobo Glo. It was replaced in early(Jan-Feb) 2014 because the LED lighting conked out on the tail end of the warranty period, but the replacement is still going strong. I can't say whether the replacement was new or not, but it did look brand spanking new when it arrived.
I've not done a long term controlled battery life test since shortly after the original unit was purchased, but I think the battery is still in pretty good condition. I usually charge when it's between 50-25% to avoid deep discharging, however it has tanked out a couple of times when I haven't been reading for a while and left it in sleep mode rather than powering it down. I usually use the light on about 30% as that seems to be the best compromise between brightness lightening the background to provide contrast without being too bright for the room lighting under which I most likely read. It's a good bit less bright, and certainly nowhere as white as the Tablet/PC screen I usually have going at the same time or leave in sleep mode if I'm really just reading. I tend most often to read while watching television, more reading while listening and taking a break to watch only when things get interesting. Keeps me on my toes and the tablet PC is there in case I want to look up a reference from either activity or need to research some other thought that comes fluttering by whilest so engaged.
I think the Glo still looks decent, especially with heavier fonts, but I haven't played with any of the newer higher resolution e-ink readers -although I do use a tablet with a 12" screen @ 2160x1440 pretty much every day and still find the Glo better for reading purposes, though perhaps not for PDFs or old comics...
All that said, I had occasion to pinhole reset my Glo tonight as it was locked up. That must be the second or maybe third time since the original unit was first purchased, a pretty decent record I'd say for something four years along, less than one reset a year!
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