I just bought my Reader (505, silver) this week, and I've been using it on the train platform to and from work, in temperatures as low as 37°F, without any odd behavior. It may help that I'm only using the device for less than 15 minutes in these conditions, as the train runs (mostly) on schedule. I guess I'll have to follow Bookeen's recommendations, though, when it starts to get colder. Perhaps I can make some kind of insulated sleeve for it, using those little glove warmers that are so popular in Japan.
