Pros: -Well the price is awesome
-Great portability (fits inside pockets)
-Decently loud
-Great Battery life
-Can be powered by usb (useless usually although)

Cons: -Speaker volume resets after switched off
-Finishing is very delicate
-Cheap-ish sound quality
-Some static distortion

Other Thoughts: Could have an upgraded version withj head-phone out with amp on it

Bottomline: Well i got this after reading the anything but ipod review. Replaced my Samsung YP-S5 with this set of speakers and an IPod nano (the irony eh?). Granted, these didnt sound as good as the S5 but my pants felt emptier since i could stash the speakers somewhere else when i listened through headphones. Good Buy

Pros: Well I should start telling what most of you want to know: This speaker is VERY loud!
It can go to high volumes and does not mess as the point you don't understand the music or fell like you are listening to annoying buzzers instead of rock.
The battery lasts a long time.

Cons: There is cons!
The speaker when turned on AND with sound coming through, makes a strange noise like a distortion, but it is a distortion that don't go up with the volume, so it can be overwhelmed at higher volumes. But it is annoying.
The price could be a little cheaper, well, it could be free but thats not how the world goes on.

Other Thoughts: You can buy it because you will use it!
Well you will use if you need one obviously.
It's has a good size.

Bottomline: Well, when I bought I thought that the usb part was used to charge it so it could work without battery and off the usb, but the usb power can only be used when connected and has no effect on charging it.

Pros: This is one of the best speakers i ever used(and i used many). it has very good sound quality for such a small speaker. it way stronger then a phone speaker. the build quality of the speaker is better then i expected for and it design very well.

Cons: the volume resets itself when turning off the speaker.
the volume button are small.

Other Thoughts: fiio is a good company.. i thought it will be Chinese trash but it actually good product.

Bottomline: if you like to listen to your music without earphones this is the excellent speaker for you.

Pros: I'm mixed on this little speaker. First, it has an amazing volume capability in such a tiny package. To be able to carry something this loud, with decent sound quality, in your pocket is a huge advantage.
It offers a great variety of powering options...the USB power is flexible for any USB output you've got, and AAA's seem to last a long time.

Cons: BUT, the biggest 'Con' of these for me...there is a static distortion that accompanies any sound coming through the system! This is especially problematic since I like to listen to audiobooks, and since they have such a limited range of sound they're using at any given time, the buzzing is extremely annoying.
Changing sources, lines, and power source, all indicate that this seems to be a problem in the electronics of the system (amplifier?), particularly since there is NO buzzing or static if the unit is simply powered on or no sound is being passed through.

Other Thoughts: I'm extremely disappointed...the quality of Fiio's in-line amplifiers had me hoping for something of similar quality. As it is, the buzzing is just too annoying for my uses (if you're going to blast a room full of music, it probably wouldn't be a problem). I believe I'd be better off putting together my own small speakers tied in with an excellent Fiio in-line amplifier.

Bottomline: Disappointed by the buzzing, particularly present at lower volumes or during audiobooks or spoken word. Other reports (in discussion on this board) indicate that this is not isolated (otherwise I might have paid for another one to see if it was any better).