My goal in buying the U310BT was to buy the most cost effective in-dash audio system that had GPS, BT, and USB features. My factory audio system sounded fine to me, but without MP3 disk or USB functionality it was getting to be a pain to add music (tired of burning compilation CDs). Also, with new laws in my area about requiring hands free phones, and getting a bit tired of hauling out my ancient portable GPS I decided to get something built in to handle it all without spending too much. This was actually the 2nd cheapest "all in one unit" I could find. The cheapest, an Eclipse unit, had so ma