I have an Ultimate Ears Wonderboom bluetooth speaker. It looks great. It sounds great for it's size, and has a reasonably bass heavy sound. The battery lasts so long that I forget it even needs charging. It's my daily office companion for ambient beats.
In the summer I take it out with me for trips round Copenhagen harbour on our inflatable rowboat.
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The sound profile is really optimised for music, so it's not so amazing for listening to podcasts. The other drawback is that if I connect the Wonderboom multiple devices, the sound intermittently stutters.