Keeping in mind "you get what you pay for," I give this 4 out of 5 stars.  The sound quality for a mono device isn't bad, but let's not compare this to high-end equipment. You can also daisy chain a second one (and possibly keep going?) for stereo -- however I just needed some sound from my VM platform, so this does just fine.  The buttons are difficult to press -- I have to actually pick it up every time or I'll push it off the desk when I attempt to control the volume.  I like that you can charge it (via USB) while it's in use.  I'm not aware of how long the charge will last since this speaker will go nowhere.  Directions could have been composed better, but this is a simple device to setup and use. 

Question: Is the sound quality of the adapter proportional to the price?
Answer: The sound quality for a mono device is n't bad