Absolute bargain, the subwoofer plays loose 5x more expensive devices in the ground. In addition, - lower volumes - even real low bass available.
I've heard the comparison:
- BOSE SoundLink Mini & SoundLink III
- Sony SRS-X5 and SRS-7
- Beats Pill XXL and BeatBox (Portable)
- UE Boom
- Jawbone Jambox Big
For battery life I can not say anything - at 30W output power are expected here, however, no miracles to be expected. Where the woofer can be even disabled on the go.