Pros Rechargeable Lithium-ion battery, up to 6 hours battery life (when fully charged), Ridiculously loud when in sub-woofer mode, Audio jack hook-up.
Cons Not really pocket size, it can fit in your pocket but unfortunately it's a little bulging. The Organizations features on the X-mini is a little over-simplified. In need of a an equalizer.
Summary The X-mini has a rich deep bass in the speaker. Incredible sound, loud and strong, this little speaker surprises everyone with how BIG it sounds. Just pop open the capsule and extend the speaker - this opens the resonance chamber, increasing the bass response even higher.
Pros Fantastic sound for such a small device, it literally vibrates around the table at full blast! Pops up to play, then you can shrink it to store. Takes an SD card of up to 8GB? Comes with 2 GB card.
Cons Always starts at full volume which is annoying. It is not on shuffle as the review says, it is sequential. Would be nice to have both options. When you plug the headphones in it plays through the speaker as well unless you press the mute button.
Summary I got the speaker only model and liked it so much I got this one. The all in one dial (on, off, pause, play, volume, jump tracks) is a matter of taste, I don't mind it. However I would prefer a separate volume dial since it is slow to change the volume with this setup. However these are relatively minor issues, it's still a cool gadget. And you can always use another music player to control it and just use it as a speaker.