The initial installation was efficient and quick. But it was very disappointing and frustrating that the smart charge app did not work. After numerous calls and emails to which no one gave me a solution I was given a check meter, so that I could monitor my usage. This is imperative as I am a licensed Taxi driver and need to for Tax purposes. What was more annoying was that it took so long to be told that there was a problem with some units and the app communicating that you already knew about but had neglected to tell me prior to purchase. Had I known this a check meter could have been installed at the same time as my charger problem solved. Having said all this the charger is working well with no current problem.