Bought these after my 18 month old Sennheiser CX 300's gave up the ghost on one side, the temptation was to get another pair of CX 300's, but was annoyed I had to buy any more in the first place, so thought I'd give Sony a go and spend a bit less. On reading reviews, even with careful use, these portable ear phones, no matter who makes them, are definitely not objects that are going to last that long if you are active. So, manufacturers, how about making these a bit more robust, I'd pay more if I knew they would last a good innings with careful use.
On to these Sony's:
1. Generally quite flimsy, wires in particular. I hope I'm not updating this in a week saying they have broken already.
2. They fit the ears well and seem to stay in place, even better than the Sennheissers.
3. The cables are the same length, so they don't wrap around the back of your head. A good feature of the Sennheissers that I'm missing already.
4. Sound quality, definitely worse than the Sennheissers (this wasn't supposed to be a comparison review...but it appears it is now!). A little more tinny and weaker bass. However, since they sit well in the ears, I get otimum sound more often. Previously I was adjusting and reinsterting, especially during exercise, so much of the time the bass was lost while they were losing position.
5. They come with a useful cable wrap so it can be set to an optimal length, preventing snagging.
6. There appears to be less feedback through the cable. Perhaps that's a benefit of it being more flimsy?
That's about it, hope it helps someone.