As you browse the site, you'll find well-known names such as ADT and Protect America. The reviews include pricing information (installation plus monthly rates) and the features that each system provides as well as the company's customer support practices. The reviews are concise and give you a good overview of each company and what you're getting for your investment.
Alarm-Reviews.Net also includes comparison tools which allow you to line up the features offered by different companies against each other. This can be helpful if you have a couple of companies in mind and want a little help making a decision. Another tool specifically offers an equipment comparison, where you scroll through pictures of all of the different equipment provided by each company--this is a great idea for people who like to see visual representations.
The site is meant to offer an unbiased, third-party perspective on security systems available in the US and Canada. If you're shopping for a home alarm system, it's worth checking out.