Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Stick with the Garmin or Magellan

This thing got me lost so many times, I was much better off without it. It often chose ridiculously out-of-the-way routes, and also tended to send me on wild goose chases for restaurants that didn't exist. The maps are frequently incomplete and/or incorrect, and since it can't be updated it won't be long before it's totally useless.There's something to be said for name brands. Stick with the Garmin or Magellan, they've been in this business for a long time and they know what they're doing.