This tactic of giving you a free steak supper and showing you burnt fire victim videos to get you to purchase their fire detection equipment has been around for years. I had them contact me once by phone and give me the B.S. story that they have the best equipment to detect smoke/fire, after listening to the salesman i told him that i have many years in the fire service and your sales pitch is all B.S.
Its all up to the person if they want to spend that type of money on smoke and heat detectors. Just keep in mind its not the heat of a fire that kills a person, its the smoke that kills a person. So buying heat detectors in my opinion is a waste of money. As for the smoke detectors, you can purchase them at your local hardware store. Just make sure when you purchase them that they have the UL label on them, that means they have been laboratory test.
Just make sure you replace the battery's ever year and replace the detector every 10 years.