Have evaluated 3 other products. They could be disconnected from power/obd or jammed for GPS or telecom signals, and after that there would be no clue of where the car went for days, until by luck or nick, police may or may not find it in a month.
Roadstat immediately can send a tamper-alert by using parallel communication. User can evolve to more advanced models for higher features as needed, including predictive behaviour analytics.