I have 3 of these CTEK chargers (I used to have 2 Optimates but they died after a few years intense use) and I find them fantastic. My bikes are all left attached in the winter months and I find that the battery life is almost doubled (I only buy Yuasa batteries). Also I recently used the CTEK when my van would not start and on the car setting it even bought the van battery back to life!!. Great devices in my experience.