I had them since 2011 and let me tell you! I’ve had to get my car towed to various service center but that not their fault the unit either just quit or malfunctioned? I just had to stop everything I was doing and once again bring my car to get serviced because if things like unit just quit? unit says I’m intoxicated? Really for Health reasons I haven’t touched a drop since 5-2013 and quit counting the false positives and I just had to continue going to get resets because of false positives and I still had to pay? Not to mention the rolling unit fails or the memory is full so the unit goes into reset mode also but that wasn’t their fault either?so basically be prepared for the false positives and the unit glitches and also get AAA because they won’t always refund your tow bill you pay out of pocket! Their customer service is mediocre at it best and they will try and charge you for everything? Like my final appt for removal I at 1st got it scheduled at my usual location but had to move it to another location and it was 60+ miles from me and come to find out that location isn’t even open today? Wow is all I can ever say? I’ve had the worst communication with this company since 2011 I honestly don’t know how they still survive! Thanks for nothing lifesaver! Did I mention the completely screwed up programming in my corvette and refused to pay for it to get reprogrammed? I had to get the car towed to a corvette speciality shop because the contractor shop they sent me to literally