Let me state first, that I am no audiophile. My music is mostly 256-320Kbps MP3s (not FLACs).To listen to the music, I use my PC/iPhone and either Klipsch Image S4i or Sony MDR-9506. These headphones are very nice and very comfortable. Still, they have the cables and I hoped that by year 2011 there would be a way to get rid of the wires. Another requirement was to be able to use the headphones for the phone calls.So I got the DRBT50's and immediately liked them. The pairing was easy and the fit was great. Then I started listening to the music.For the first 10 seconds I liked the sound too: the bass is quite rich. But then I noticed that there was no trebles. The impression is that the sound is cut off somewhere around 10Khz and you get nothing above that. Tried it with several players and even with a notebook -- no luck.Also, the music was ''''''''' breaking for half a second, even if the phone was in my hand or pocket.The problem might be not in the DRBT50, but in the Bluetooth protocol limitation: with all the recompressions, software might be trying to remove something, which is not very important. One of the web pages (did I mention extensive Google-ing?) even suggested, that the lower the quality of your sound is, the better it will sound via bluetooth, so 128Kbps will sound better than 256/320Kbps because of the compression overhead. Don't really know if it's true...Sending DRBT50 back today. I guess, it is too early to get rid of cables.Some comments about the ratings:- Comfort/Construction quality is great (which is usual for Sony)- Ease of use: 3 stars, because the control buttons are tiny and hard to reach. Maybe it will get better with time, I just didn't have that time.- Microphone quality is not that good. Could be because of the position (right earpiece), but the sound was muffled and hard to understand.- Sound quality: below average.- Battery life: Charged them once, was enough for all tests. So I guess it is good.- Range: didn't actually test it.