Pros: The pros:fits in ear, and the fin makes sure it won't come out of place. It might look a bit uncomfortable by the looks; however, you barely notice its even there. Sound quality is fine, and the clip was nice for when i was lifting weights.
Cons: There was only one con; however, this should be the deciding factor. I've gotten these headphones twice, and the exact same thing happened both times. The first time, the headphones worked for 2-3 months, then one ear went out, then the other. I admit I was a little rough with them, and loved them, so decided to by them again. I treated it like it was my baby, made sure that I wouldn't let it snag on anything. However, after around 4 months, one ear suddenly went out,...
Pros: These are great sounding earbuds. I have no issues with the earbuds at all. I have owned them for about 18 months now and the still work great. The noise isolation is awesome. I have worn them on the inside of a C-17 and listened to music. Shot a .50 machine gun and had still no trouble hearing my music. Also, the fins are great at staying in-ear. Running, and lifting weights I have had no trouble using them.
Cons: On the other hand the volume control has broken twice. The first did not last long at all. Then I actually found another one that someone had lost. Same thing happened with it. The female end of the volume control starts to give the headphones an underwater sound when it is even slightly touched. Even with the volume control broken you can just use them with a shorter cord. Even though it is very convenient I would just go with the MX680i
Summary: If you want heavy bass in an inexpensive sports headphone, you're pretty much out of luck.
Pros: Once you figure out the size fin that fits your ear, it is irremovable short of divine intervention, and pretty comfortable. You can either use the foam pads over the speaker, or go with the air cushion. I went with the cushion since I use these solely to work out with and sweat on foam is meh.
Cons: Like all headphones that don't seal the ear canal, the bass is weak, though better than most.
Pros: Good sound, helps drown out the bad so-called music they play in the gym over the loudspeakers. The earfins actually work great; never had them fall out when performing aerobic activity like other ear buds do. These do what they are supposed to, save me from having to use my CX-300s in the gym.
Cons: Wish I had gotten the sound isolating version, but these were on sale and fit the bill.