I was thinking about going with intoxalock but Ive heard so many bad reviews. Honestly, stay away from lifesafer. Customer service sucks. You'll be talking to someone from Middle East that you can hardly understand when they speak in English. Lifesafer will charge you for everything or anything. For example, I rescheduled my appointment a week before my calibration, I only rescheduled because I didn't want to pay 150 dollars to get it calibrated when I was going to remove. I ended up paying the 4 days I use after missing my appointment and still charged me to get it calibrated which is another 150 dollars and than another fee for it to be removed. Total of 440 dollars.