Pretty Great. Might have an issue with Mac OS 10.8.5
I have been using previous versions of Noizio and really enjoying it. It has a very clean design that does what you want it to do without tons of clutter or useless extra features. Only issue I have is that is downloaded the update (version 1.5) and it wont seem to run on one my iMac running Mac OS 10.8.5. Strangely the same iMac running 10.10 runs it fine.
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Noizio — Calm, Meditate, Sleep, v1.5