Andy,
Was just researching these yesterday for my parents. Here's the deal.
$300 for the system and installation. It takes the pros three hours to do. The starter works from 1,000 feet away. If you start it remotely and don't go out to your vehicle, it shuts off after 15 minutes of running.
The biggest watch out is if you own a newer vehicle, adding the remote starter can void the warranty.
My mechanic buddy won't install them, because they are sometimes known to create ghost electrical issues that are near impossible to pin down.
Am not sure if they are universal, becuase he did ask the model of the vehicle. Don't know if there are different prices for different models, sizes or brands.