Have just tested the small cube and am very happy with its performance. I find amazing what is to afford this Miniwoofer able. The coil is also quite fast on the road, resulting in a crisp and not lumbering bass provides. But if you bring the device to its limits there is annoying vibrations that can migrate in MiniDock HTC and degrade the sound quality. So if you really bass-heavy music (eg. Basstest music) should be phone does not have standing in the dock. In addition, the woofer could be relatively little louder, because the boxes of the HTC One's prefer something. But you can regulate useful with NEM equalizer. The Bluetooth connection works very well and there will be no delays in the sound transmission.
I'd buy the cube again.
+ Surprisingly good, crisp and not cumbersome Bass + Bluetooth connection is working without delays + Current price of 71.77 EUR is IMO in order - Volume relatively too low (Equalizer can create here remedy brachbar)
I can not say anything about the battery life. If he keeps the specified time almost, but you can be very satisfied.