The operation is quite simple once you have read the user guide (which is very concise). Having several cars including a rolling very little that makes me the biggest services.Il also serves me for the riding mower that should have a battery charge remains even in winter when it is not running. The price is a bit high but given the price of a service or a new battery, it is a worthwhile investment in the long term. I also appreciate being able to connect without removing the battery, which caused problems with my old charger on recent cars. Finally, the test function to see in minutes if a charge is required and if the battery is still good. The small storage bag is a plus, not stupid at all. In short, I think it is an excellent product that has its place in the garage as is a tire inflator for those who want to have a car in good shape.