This seems like a solid product although I have to say I've only charged my 12V AGM lawnmower battery so far. I like that there are different modes. I have a marine battery that is not an AGM or deep cycle battery, but more like a starting battery for my outboard. I love how NOCO explains the different modes and how to get the most out of each battery type. When I first used the charger I found that the switches were unresponsive, but I've gotten used to it. The mode switch sometimes does not respond. According to the owner's manual, I charged the mower's battery, which didn't take long, so I knew there had to be sulphation. I opted for repair and it took about 3-4 hours. After that, it goes into charging and then into standby mode. After 2 days I still have a fully charged battery. I also have three cars and will soon have two solar powered deep cycle batteries for the barn and an extra small deep cycle battery for the boat (separate from the starter battery). So only 7-8 lead-acid batteries. I'm glad I bought this product, I expect it will help extend the life of my batteries.