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.
Pros Good sound quality for the first five months
Cons In the six month these headphones completely broke with static and alternating sound in each ear.
Summary I thought these headphones would be great and last awhile particularly because they were so friggin uncomfortable. However, in the fifth month of using them on a daily basis at the gym there was no longer sound in the left ear and then I lost sound in the right.
Pros Water-resistant, sound quality, excellent customer service
Cons The rubber ear-pieces covers could be a little softer
Summary The headphones that came with my Rio got so rusted that they sounded like they had grains of sand in them. I looked at MANY different headphones. As you can guess my #1 criteria was water resistance. I liked at the OMX 90's. They were water resistant, but not suited for sports. Talking to Sennhieser customer service, they recommended the PMX 70's. I LOVE THEM! BTW: Customer service was friendly and intent on my satisfaction. Gotta give 'em a 10.
Pros Sound quality. Fit.. Single cord
Cons Lost a neon green ear cover, Sennheiser logo fell off.
Summary I really like these. They easily got me to give up the lame 'ear buds' of my iPods. Wear them all the time for use with any number of applications.
Pros excellent fit; great sounds; and far exceeds those of more expensive models. I use mine at least 3 times a week.
Cons None... worth every penny (bought 3 sets for the entire family)
Summary You can not go wrong with these headphones. One of the best MP3 headphones on the market!