Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Works...but!

The unit does a good job of giving directions. Although the software is rather in-flexible. It always picks the shortest route, not necessarily the easiest route. The unit has locked up on me a number of times, requiring it to be reset. I suspect it has something to do with heat. As it has happened after returning to the car after it has set outside for an hour or so. Tech support was prompt in their response, but no help. At this time there is no way to register the product on Harmon Kardon's web sight.