Hide it? Never.
I read it wherever I have a chance. Normally, when in public, that will be in airports and on aeroplanes. I'm a seaman and travels alot. However, I seldom see other readers, but there are "thirteen on the dozen" of ipads and the like around in the airlounges and transit halls.
So far, since I bought my reader last September, I haven't had any comment on it, albeit a few looks though.