Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent product. Worth the cost

I bought one of these as a gift for someone who like me has a pickup truck that is rarely driven and then bought one for myself. Of late, I found myself dragging out the jumper cables or my large battery charger because the thing kept going dead. I hooked up the Battery Tender and no more. I can see from the door that it is on and charged and I haven't had any trouble since. Ordered the Junior for my riding mower and awaiting it's arrival. Since I usually have to buy a mower battery every year, If I extend the life of the battery even by one year, the Tender Jr. will have paid for itself. Well worth it.