True Power of Bass
Can be purchased from Top Dog Headphones if in the UK like me. Here is my review http://www.head-fi.org/t/630020/review-digizoid-zo2-3-personal-subwoofer-portable-headphone-amplifier-review-true-power-of-bass
Pros: Great bass boost, easy to use
Cons: Colours instead of numbers, no volume control
Pros: Best bang for the buck bass amp out there!
Cons: Constant buzzing heard when charging while listening, via USB. Thus it's better to let it charge overnight, and enjoy the Zo unplugged from the USB.
Pros: everything
Cons: none for now. coz it is what it is.. and im happy with it.
Pros: Good Marketing
Cons: Not as slim as the MiniBox-D I was considering
Pros: works as a decent amp, and the bass boost feature is surprisingly effective
Cons: the target market is a bit hard to define