I wish there was a way to give negative stars to this company. If only I had checked Yelp before I had my interlock installed! I chose them based on their BBB rating which was an \"A\". Service wasn't \"too\" bad at first. However they did completely screw up my electrical system with the installation. I had to take it to the dealer to have it fixed. The dealer wouldn't release my car until DA paid for the repairs. The dealer called them every day for a week and they did not respond. Finally they felt bad for me and gave me my car. I don't know if they were ever paid. \n\nAll the previous comments are true... device takes forever to warm up. In the Phoenix summers, this is miserable. And you have to do the suck back method which if you don't do perfectly you have to repeat until you get it just right. I almost passed out many times from being so winded from doing it again and again.\n\nWhen Guardian acquired DA, it was like watching a damaged ship finally sink. No one answered the  phone anymore... it went straight to voice mail. The nice flat panel TV in the lobby playing Pandora while you waited disappeared. All the employees I'd come to know in my monthly visits vanished. Then it got ugly.\n\nI started my car like always and when it asked for the rolling retest 5 minutes later it said I failed. WTF?! Then it made me keep taking the test over and over and over while I drove home, failing me each time. It finally stopped beeping as I pulled into my house. The next day I get in my car to go to a meeting I'm facilitating and it has permanently locked me out of starting my car!!! There's no nice override code like the other places so you can drive in to resolve it, no, you have to take off the device and have someone else drive you there. This is Saturday and they are only open Monday thru Friday.\n\nSo they put the device on their little tester and tell me I refused a rolling retest so they are reporting me to the DMV, my contract will be extended for 6 months, and  that will be $95. Are they kidding?! Uh, no, they're just crooks. They told me I must have been drinking in the car after I started it or this wouldn't have happened. Wrong! Then they said that must be why I refused the rolling retest. Wrong! I did the dumb rolling retest over and over and over until I almost passed out. Well they tell me, there's nothing they can do. Well I tell them, then take the device out and I'll go to another company. Btw, the \"fines\" for violations prior to the Guardian acquisition were $40 and they raised it to $95 without any notice to customers (who have a lease contract).\n\nNow I have a dispute on my hands with the DMV thanks to DA/Guardian. AND the best part, when they removed the device they gave my car a nice long scratch on the passengers side of my Lexus as a parting thank you for my business... after I had the car completely detailed 2 days before. Not only is this bad business, they are criminals.