The UE app adds more options, including a multiband EQ, the ability to pair the speaker with up to 150 other Ultimate Ears speakers, and an Alarm that lets you wake up to the last song played. There's also a new megaphone feature that lets you speak through the speaker from your phone, which could come in handy for calling the kids in for dinner a la intercoms from the '80s.
You've got to adjust sound expectations for any speaker as packable as the Boom 4, but within those constraints, the speaker provides a remarkably pleasant audio experience. Its dual drivers are designed for 360-degree sound.
As for the battery life, UE claims a whopping 15 hours per charge, though I think that's ambitious. I've never got more than around 12 hours in testing, but your experience will vary depending on where you keep the volume.
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