Playback of individual voices on the Flip Ultra itself is hard to hear, but not when transferred to your computer. On the other side of the coin, I recently recorded a brass orchestra in a hall with excellent acoustics. The results? The quality of playback was very good and loud on the Flip Ultra and spectacular when played back on my combination computer/stereo system.
Just got a Flip Ultra 2 3rd generation. The audio is so loud that it breaks up. I record music videos and my husband records speaking videos and in both recordings I can hear a distortion and almost like a "chatter" behind the audio. Not good.