I have the International Battery Tender Plus (I needed the dual voltage version, since I live in Europe). I really like it. For the US, you can probably save a few bucks and go with the Battery Tender Plus Portable Charger. The one nice thing about the international model, is that it is a bit smaller than the other one, and they both should provide the same performance. If you tend to leave your car sitting for more than a few days at a time, one of these is a must have. It keeps the battery perfectly topped up, which is critical to preserving battery life (and the battery for this car is not a cheap item).