I got one of the advertised car alarm installations. They didn't tell me that the remote would not lock/unlock the car, only switch the alarm off and on (there is a lock/unlock symbol on the remote, so I ASSUMED it would unlock and switch alarm). Locking is 50 bucks extra, not to mention I have to drop my car off again. Deceptive. I had tints done later, took it to someone else.
Cons: Shady. Plenty of other places to go.