Pioneer has done marvels with their echo cancel on the Bluetooth portion of this stereo. They are using a double boom MIC to help eliminate as much as possible. The double MIC also helps with how well the person on the other end can hear you, older HU you had to yell at inorder to be understandable.
USB level input is easier than using a computer. If you can upload it, you can access it on the stereo. Press list, find what you want, and press enter. Be warned though, if you want the USB run to your glove box be ready to pay extra for a USB extension. Pioneer decided to cut costs and that extension cable was one of their unneccesary expenses.
Other then that, you can't go wrong with Pioneer. They have been in the business for ages. Time heals all wounds, with the amount of time they have worked on that stereo, they have it pretty refined.