I bought this unit to replace a similar old Stanley BC209 charger/maintainer which I gave my son as a gift. This newer version works well, although its maximum current rating is lower than the previous model (1.0A vs. 1.5A). I also found that the lights on the new one were less visible than the old ones, particularly the green "fully charged" light. The fact that the new one is significantly smaller also means it runs warmer, which isn't always a good thing. And finally, it's missing a cigarette lighter adapter that I've always used to service the battery in my wife's little-used old car. So I can only give it 3 stars.