I have always been a big fan of Harman/JBL speakers. Despite being based on a several year old design I still think the latest go&play wireless version to be one of the best looking and sounding boomboxes around, with the only downside of a castrated sound when run from batteries. I was also very impressed by the JBL Radial, when I heard it for the first time, as well as the JBL On Stage 400-Series, which produced quite a big sound despite being rather small.
So far unfortunately none of the real portable and battery-driven speakers from Harman or JBL managed to convince me. The JBL Charge being larger while costing only slightly less than the Bose Soundlink Mini is not able to produce such a convincing sound as the Bose.