Hand on heart, I wasn't expected such great results from this powerful little speaker. I have in the past forked out nearly this much for a plastic light weight version (using the same bellows principle and the results were just OK.
The Marware UpSurge is in an altogether different class ... weighty, well designed, and with care should last years ... ideal for traveling, and here is my only negative comment ... for something so well designed for travel, why is there no case ... or even on-board cable storage ... even the plastic version had that.
Getting back to the positives ... the unit charged using a USB to mini USB lead in no time at all, and if you are boosting up the often flat performance of a laptop speaker set up ... you can charge and play at the same time. There is a claimed run time of 5 hours ... not fully tested to verify that, but I have used it twice for an hour or so and still going strong.
The sound is reasonably crisp and clear and if you put it on a hard surface like wood or glass you get a better base response. The volume was fine for me, and distortion free all the way up to the limit on my players.
I'm not sure why Marware are aiming their marketing for this unit specifically at the Kindle user ... it has worked perfectly with laptops, iPads, iPhones and other mp3 players.
Great for holidays and it would be churlish to dock a star for the lack of a case. Would love to see this as a stereo unit ... maybe fitting together with a magnet and including storage for the lead.