My Glo is 6+ years old (Got it in Oct 2012) and it still works very well, comparable to when new, with some decline in battery, but really very little for a 6 year old device. I don't use it as much since I got my KA1 this year, but it does still get used, often a few times a week. It is on very old firmware, mainly because it works well enough as it is, and I don't mind not getting library books on it automatically.
I don't read on it often enough to give a "reading hours" estimate of how long the battery now lasts, but it usually has battery when I want to use it, despite leaving it for long periods in sleep mode. Occasionally the battery has suddenly gone dead, but I am 99% sure it is just that the sleep cover wasn't properly aligned when it was put down. That used to happen occasionally, even when I first got the sleep cover, but as it became more worn, it would happen somewhat more frequently because the spine was more flexible, so wouldn't close automatically to the right position. It is the official sleep cover (grey fabric, can't remember how that was marketed), and other than that the cover has held up well, for almost 6 years now.
On the whole, I am still pleased with it, and might never have bought my KA1 a) if I didn't find the frontlight too bright at night, especially when reading to get back to sleep (ie was asleep previously and eyes didn't want to see ANY light!) and b) if I hadn't had enough gift cards to buy my KA1 for less than a dollar.
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