My fiance found a pair of these on the ground on campus the other day...
I was reluctant to even put them in, as after browsing here and falling into a deep lust with Sennheiser products like my HD595's while appreciating what 20 or 30 bucks can get you in the IEM department (once you take a few minutes to equalize) such as my Fiance's CX-475's, as well as hearing a pair of skullcandy's once before for the ten total seconds I could bear it, I was pretty damn convinced this brand would give me ear/brain cancer. 

I had her guinea-pig them for me first, and before I let her hit play, I turned away from her and wrote a short list of all the shortcomings I predicted just from prior knowledge of the brand. things like being Tinny/sharp, and overall very washed out and terrible. She cringed immediately after pushing start, having just come from a pair of her Senni's (though I'm not sure which), and pulled them out 15 seconds later with a look of sheer disgust. I expected this, and decided, for the hell of it, to see how terrible they really were. 


Now, here's the crazy part. They were bad. I came on here with EVERY intention of reaming these little things so hard you might instantly assume someone wearing them is actually doing so in an attempt to plug the fecal matter and keep it from leaking down their ears and neck.... I found myself wishing I could locate the person who dropped them and both congratulate them on tossing them, then telling them what TERRIBLE taste they had. 

But then not 10 seconds before I began typing this, I decided to look on google quickly for a price.

I was expecting 20-50 dollars. These little things sell for 10.
That's actually less than I paid for the pair of known-to-be-garbage tier Sony throw-away buds at the drug store, which I bought for when I was working the bin changes in the grain elevator (It was FAR too dusty to bring ANYTHING I actually cared about there).

That now being said, I view these things with a tad-bit more respect. By comparison to anything that is in any way remotely decent, they are STILL garbage, however they are MUCH better than what you'll find in a typical drug-store, dollar-store, or supermarket for the same price.  washed out, yet still sharp sound, don't seal well, feel kind of flimsy.... All the problems and shortcomings you expect of any other kiddie-level or "Came in the box" earbud, but with noticeably (and for the price level, I suppose I can choke out the word) "clear-er" bass.  For ten dollars, you can't really talk down on them. 

If you need a pair of disposable headphones, why the hell not? I'd use them in dire emergency... I'd wear these for a week before 10 minutes of a pair of Beats, But I'd still probably choose my S3's phone speaker over them if it's a viable option. 
 
I suppose they're best suited to middle-school children who can't yet care for nice things, and want to look "Edgy", "Goth", "Hardcore", "Punk", ect...

I bought this player a few years ago, and wish I still had it...
This player sparked my interest into higher quality music, and I absolutely loved it.
 
There are a few different options on the O2 for storage space, 32 gigs being the biggest, but all are expandable via an SD card slot. 
The audio quality was great, I had it paired up with a then new pair of Sennheiser HD485's  and the battery lasted AGES. Well over a hundred hours of music, and something like 8-10 hours of video.

The player supports just about any format you can think of for both audio and video. No encoding needed, just plug it in to the computer, and drop the files right on in. The player had some audio enhancement options including an interesting 3d surround sound option, and an equalizer, as well as subtitle support for video. Standard Def. Videos look VERY good on this player, the screen is bright and colorful.  I frequently used it to watch shows on my lunch breaks.

The O2 is a bit large, but still fit into the pocket of my jeans (Though the large exposed screen made me not want to do that very often, as I can be clumsy sometimes). It came with a small wedge which you can loop through one of the corners, and it functions as both a stylus and a sort of prop-stand for putting it upright on a table, which I thought was very useful. It also has a small built in speaker, which works to a fair volume, but don't expect too much of it. It's very tiny after all.
 
The only thing wrong with the player was the user interface. It functions as it's meant, but the icons for buttons and files in lists were small, and it was easy to miss your target, buttons on screen corners could take a few tries to hit, and there was quite a bit of navigating through the player. Once you figure everything out and get used to it, this really isn't a huge problem, but that takes a little while, and it could have certainly been refined a bit. 

The reason I Don't have this player anymore is tragic. 
Getting out of the car one day, I had it in my left hand (I'm left handed), and as I got out, somehow it got loose from me, and fell fairly gently 3-6 inches landing face-down on the driveway. I picked it up and to my horror found a pointy grain of sand had been JUST tall enough to go past the small gap between the case and the actual screen in the front to stab it right near the middle, and cracked it! The actual touch film part was fine, but the display beneath was punched. Colors bled into each other, and within a week it functioned no longer. I don't know if that's just my bad luck, or a fragile screen.

For someone who wants good audio quality, and would like video playback without the length and hassle of encoding and loosing video quality, I'd most definitely  recommend it.