After more than five months fascinates me still the sound and especially the bass of the small dwarf. It is sonicated my 45sqm large living room amazing as the relatively small device. In my, open to the living, kitchen 16sqm vibrates with rich bass titles cover the coffee automaton. No Joke! It may be that there are docks that play fine, there is probably no better bass provides. This does not mean that the HD Go + Play sounds bad, the sound is excellent overall.
Battery convinced only moderately: batteries quite quickly empty and the sound is not as good as in mains operation.
Who does not attach great importance to the mobile properties, do not get a better device for 300. Desirable would have been Apple's AirPlay.
Would not buy the device immediately. Have so far heard nothing better.