I have now brought me 2 mini speakers, Rokono B10 (25) and the Sony Ultra Mobile with 360 ° "Circle Sound Technology" (50), so I can only compare between these two.
The B10 can Rokono louder, has a good bass and not rattling even if it is on full blast. The Sony is almost exactly the opposite.
The Rokono B10 is heavier, feels very stable at because it is made entirely of metal, except for the lower section. Those who want to save weight selects another mini speaker. Who wants another transfer than Bluetooth, could also choose a different speaker. If you want good sound, "must" choose the Rokono B10.
I am also not a sound expert but the difference ziwschen these two speakers, I could clearly see.
The sound of Rokono B10 is IMHO very balanced and you can really crank up loud.
So people does not take long, if you on this one pushed for, you can not go wrong.
Many greetings
Sordo