The use of the connection to the phone (iphone 5s) via Bluetooth comes in handy when I get phone calls and the ability to call a contact in the phonebook, recent calls, missed calls. It can play music from my phone.
The USB port is compatible with various formats: MP3, WMA and AAC especially (the rependu home because a lot better than mp3 at equal speed). You can also browse the files, play the next / previous folder with two folder +/- buttons or the scroll wheel on the steering wheel control, which saves me time when you are too many songs to fly.
The downside is that the radio will not play songs in alphabetical order but the oldest to the newest, I disagree! (Even worries about sony ...)
No CD: This is not a disadvantage because the CD is OBSOLETE! Why the fragile cd when there is already a USB port. The absence of the CD player did reduce the price of post obviously.
Between choosing a radio with CD that has no Bluetooth or Bluetooth without cd with the same price, the choice is quickly made.
The downside of this post is that the male-male Tuner adapter is not provided! Something I did not expect, I was forced to buy one.