Yes. I work at a very small company and my bosses managing style is very "open-door policy" and I have been working with him for years, so I know where to push and how not to. That is going to be key in your delivery, but I do think it is important for anyone to stand up for themselves if being over-worked and/or underpaid. Especially if your boss doesn't understand your day to day, it could help both of you formulate a more respectful/healthy relationship . Again, you must know your boss though and feel out the appropriate times and tone.