I turned mine way up, and after being disappointed with the volume level, I returned the iPad. The speaker (1) was facing the wrong direction, away from the user, and for me, it was not loud enough and hope another version will see it facing the user, and in stereo. Headset was OK however.
Don't think I've ever put it to full volume. Somewhere around 3/4 is good enough for listening to news or podcasts. If I want louder music I stream through the Apple TV connected to the stereo or with Bluetooth speakers. I got the FoxL V2. They are great. Compact enough to carry in my computer bag when I travel and they sound great.