Interlocks can be pricey, but the service is what you pay for as well. The previous interlock company i had experienced was horrible with a faulty handset, extra charges, and appointments were only at their leisure. Since i have transferred my interlock to AZ Interlocks the process has been smooth, my monthly payments haven't changed, my device works fine, and the process was made easy. Their was one instance where i had a issues with starting my car after a mechanic had fixed certain issues to get my car re registered, they took my call immediately, and had me bring it in. Good service is rare nowadays where everyone feels entitled, but not this company, if you need any help with your interlock, or service this is the place to go to without a doubt.