First time user. No phone call at 1 hour and 50 minutes into my 2 hour service window. I called in, they were not able to reach their technician. waited another 50 minutes, I called in, still no word from the technician. waited 30 minutes and called in again. Just cancelled the service. Sum it up. Reliability is absent. They never called me to tell me they would be late, and when I pressed them to get the work done today, they will not guarantee that the battery will be installed today. My 2 hour window was 1100 to 1300. Waist of my time. Do not recommend them if you are expecting them to get the job done as scheduled or in a timely manner.