Just bought the MDR-1RBT for about a week now. I choose the bluetooth version because I have never have a bluetooth headphone and the idea of wireless is very interesting to me. I connected my 1R to my galaxy S4 using the NFC connection. Now, I can walk around the house without bringing my phone and having no wire is really great. The sound through bluetooth is exceptionally good, the connection is really strong.
The sound is typical closed headphone as my other headphone is MA900 which has a very spacious and airy sound. At first, the sound of the singer is so far away or buried in the center which makes me turning up the volume more. I have burn-in the 1R using pink noise for about 20-25 hours so far and the sound has opened up significantly. So far, I am liking the sound from the 1RBT.