Instruct: Classify Amazon reviews into positive or negative sentiment
Query: XM Radio INterface is unusable

The AVIC-N2 is an excellent radio and GPS tracking system, but the price that they charge for the XM interface you would at least expect to get the functionality of a standalone $49 XM radio. There is no channel guide, no channel description, no channel groupings. If you do not already know he channel numbers the unit is unusable. They have since come out with the N3 which fixes the issue but they have no plans to help the thoudands of people that paid lots of money for the N2.