I bought this a few weeks after buying the Addon C10. The C5 is quieter and delivers less bass, which is to be expected from a speaker of this size. If you want a single wireless speaker then go for the C10, especially if you're going to be using it in a large room. However, as a second speaker to use in a small room and take outside occasionally, this speaker is great (or for listening after the kids have fallen asleep). If you really want to rock out, the speaker has a decent volume and sounds good even at maximum volume. Other considerations: Pandora doesn't work wirelessly, but I love Spotify (although only the premium versions work wirelessly). The app is clunky, but it does the right thing (e.g. the ability to sync your speakers, which works well.
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