"Sound is fairly good, but mechanical design is klunky."3.5 starson by DSPGUY2
Pros: Good sound. Good bass and mids. Durable. Secure in ear.
Cons: Band gets in the way in weight room. Cord is annoying.
Summary: All in all, I really like these earbuds. I recently tried four different sets from four manufacturers.
Senn PMX 70
Sony MDR AS50 G
The PMX70 came in second. The Koss came in first and are the ones I kept.
The PMX70 overall sound was probably the best of the four. But only a tiny bit better than the Koss. The PMX70s had more bass, the Koss more mid and treble.
The main problem with the PMX70s was physical design. The behind-the-head support band kept getting in the way of the headrests on the weight machines in the gym. And the 4-foot rather stiff and heavy cable was highly annoying. Nowhere to put it. I keep my iPod in my headband so I only need about 8 inches of cord. Most people in the gym use an armband, so they need about 18 inches. One could drape the excess cord down through one's tee-shirt, except the PMX70 cord was quite stiff and coiled, and it wanted to stay that way, sort of. I could force it to stay tightly coiled, but that produced an annoyingly heavy weight hanging from the earbuds. It was just a nusance to deal with. The Sony and Shure earbuds had it right. They give you an 18 inch cord with another 2-3 foot extension if you needed it. The Koss had a four-foot cord, but it was light and supple, and was not annoying.
I found the PMX70's to stay secure in the ears and were generally quite comfortable, except for the headband/headrest thing I mentioned above. Since I like the sound of the PMX70's a little better than the Koss's sound, I almost kept them, but didn't. The Koss's also cost half as much.
I would recommend the PMX70s to anyone. Perhaps some of their earbuds from the same line without the headband would be more pleasing to me. I would say that the headband would probably not be a problem except for someone using weight machines, so this may be a non-issue for most.
I have seen several negative comments about the lime-green color. It's not a problem to me. I like it. However, if color means a lot to you, that's another advantage of the Koss units. The Koss KE29A earbuds come in four different colors.