I've purchased this over year ago, I need to say battery went out after 1.5 year usage but they quite cheap, easly replacable and now I actually have 2 of them so my ION can go for 20+ hours. You cant go wrong buying this speaker!!!
I only miss BASS adjustment but I suposse you can use equalizer from your device.
Even with battery problem and lack of BASS adjustment this is 5 star for me.