I use it: - Sitting on the couch - Lying in bed, on my side or back - Sitting at my desk, holding it or with it sitting flat on the table - Walking dow

I use it: - Sitting on the couch - Lying in bed, on my side or back - Sitting at my desk, holding it or with it sitting flat on the table - Walking down the street (if I need to look up something) - At cafes, etc. Perhaps I just have large hands (~9 inch handspan) and can get more leverage to hold it properly, but I haven't had a problem. Your arm will get tired eventually if you're not being ergonomic, but generally I haven't had a problem.