I have a guest. The previous owner replaced the old one with that before we took delivery of the boat. The original guest charger was not working properly so we had them replace it, and they put another guest in. Hope thisd one lasts, if not it will be replaced by a Charles. We use the Charles chargers them where I work and our electrical systems on our boats are much more complex and they work great and our owner's client's seem to like them and have good feedback on them.