I believe that at this price level, this is the best buy you can do, because beyond, it becomes necessary to double the price for better sound. For example, the Bose Bluetooth speaker - Bose Soundlink- may have a better definition of the sound, but it takes 300 euros for the final a slight performance gain. It's way too expensive for my taste.
Otherwise, I take it one star because to enjoy the best sound, it must be used with the supplied AC adapter. No AC adapter is lost in low frequencies. I do not know if it is a voluntary choice to prolong the battery longer, or simply, the battery does not deliver enough power. I would have preferred a bass boost mode batteries for the same sound quality even lose autonomy. Also it would have been better to have normal AA looted rather than the battery supplied, which will be hard to replace when worn. A good point as to which Logitech provides a 3.5mm jack cable male - male to directly connect the player to the speaker bluetooth. It increases the possibilities and it also allows to have a better sound than with Bluetooth. FYI, this is not to the speaker but the standard Bluetooth A2DP that compresses the audio stream. So there's a loss of quality dice that makes streaming Bluetooth, whatever the speaker. But Boombox speaker perfectly compensates for this small defect bluetooth, so in the end, the difference between the two modes (wire or wireless) is not huge.
Ergonomics, finally, is exemplary. A button to turn it on, one for Bluetooth pairing and two buttons for volume. This chamber is very easy to use and has a folding rear foot, which turns out also very practical. I wish I had the enclosure comes with a pouch for transport. While waiting to find a pocket, it will always ensure protection during transport if you do not want claws appear fast enough.
I took a lot of time to find a Bluetooth speaker that offers me a good compromise quality sound / portability at a decent price and I have to say that with this product there, Logitech hits hard. I am delighted with my purchase and in addition, the price is more than correct compared to Bose or Jawbone that raise prices excessively on what type of speakers.