We used (until Subaru said 'fuck you, pay us') the mobile access so that I could unlock my family member's vehicle when I rode along with them or remote start it ahead of them while we're out and about. It's nice to be able to get back into the car and sit and wait without having to grab the key out of their purse.

They hook a lot of people now with the first couple years free, then spin around and go for a $150+ a year whammy. We gave up.