Get it: Improved over previous model and cheaper,
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This review is from: Sony DSXS310BTX Bluetooth Digital Media Car Stereo Receiver with Pandora Control (Discontinued by Manufacturer) (Wireless Phone Accessory)
I wrote a review of the 300BTX. Now I've purchased this model for my wife's car. The 4 way selector seems to be better on this model, but maybe my other one was bad. (I attempted to discuss with Sony, but their support was not worth having a discussion with.)
Another problem with the older 300BTX is the microphone on the unit was poor so I had to purchase the external mic separately. On this model, it's included and the unit is even cheaper.
(By the way, just for grins I switched faceplates on the 300BTX and 310BTX and it seems to work. So the faceplate is just buttons and display, no brains.)