Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Passport 8500 X50

My first time radar detecor purchase/user. Did a lot of research on theweb and the 8500 X50 was highly recomended above most others. Since I amnew to using detectors, I can not compare it to any others. The unit doesalert me of a radar in the area. The range of detection varies greatly.Sometimes it will warn me over a mile away and other times it goes offjust as soon as I spot them. I drive 80 miles one way to work and haveabout 3000 miles of testing with no tickets.