As of 2015, some common problems with Viper car alarm systems include unclear installation instructions, faulty remotes and wrong wire labeling, according to customer reviews at Amazon.com. However, the majority of users give Viper car alarm systems positive, four- or five-star reviews.
Some of the positive aspects noted by Amazon reviewers include Viper alarms' reasonable cost, loud sounds and built-in shock sensor. They also appreciate that they can control the system using a remote. However, user reviews remind customers that warranties are not valid for Viper alarms unless they purchase the products from an authorized dealer. Customers can visit Viper.com to view a list of alarms and authorized retailers.