To put in my two cents, getting the alarm system for the Camry is only worth it if:
1. It is free. (Dealer installed it without extra cost when you purchased the vehicle.)
Don't pay extra for this "dealer alarm." Unless if it is free, it is a complete waste of money.
OR
2. It has a remote control which notifies you if the alarm is triggered.
Otherwise, don't waste your money. Car alarms that lacks the notification feature is useless. It gives you a false sense of security.
Seriously, do people pay attention to car alarms nowadays? I don't, and I haven't seen a random Joe run out and check out if someone's car is being broken into when the alarm is going off.
Bottom line, they will take it if they want it, so insure it.
However, I think lojack feature is good.