I spend a fair amount of time away from home and want something portable so I can listen to music or audiobooks while cooling my heels in a hotel. This fits the bill.
It's very small, but surprisingly capable. It's ideal for small quiet rooms such as hotel rooms, but would struggle outdoors or in a noisy environment. Audio fidelity is hardly high-end, but that's not the purpose here. It's perfectly serviceable and does the job.
The speaker does not have its own volume control; the volume is controlled by the source device, with the speaker amplifying whatever it receives. If the source signal is too high the sound will distort; the built-in amplifier is actually a bit too strong for the speaker. The ideal volume "sweet spot" will likely vary from source device to source device, so some experimentation will be called for.
The battery life is fine for me; the most I've ever used it for at any one time is 2 hours, and it still didn't need recharging. I don't know how well it would fare for longer use.
Finally, the colour is delightfully garish, so I'm unlikely to lose it among the myriad black devices which litter my life.