This black model is the same as the red one, but was discounted $8 less than the $30 red one. (Guess people like red better).It charged two heavy duty deep cycle boat batteries (protects them from winter freezing). It advertises a 10 amp charge rate. It's definitely better/faster than similarly priced trickle chargers (which it does also). I charged one battery at 10amps and one at trickle. They both show a full indicator, but while the 10amp charger seems to completely turn off when full, the trickle charge stays on as a battery maintainer. It has a built in fan which runs automatically while it's charging. Unlike some similar chargers which advertise copper clamps this does not, and it' seems , with a magnet, that the clamps are not copper. They could be a lower grade stainless, but since they are fully insulated (a good thing for tight spots), it's hard to know exactly what they're made of. Unless it's being used in a marine environment, not sure it makes much difference, especially cause no part of a charger should be exposed to water. The clamps don't get hot at all, so there can't be any power drain during charging, whatever they are.The quality seems good, and more than adequate (other than for commercial use), as it does so many things, including a reconditioning (desulfering?) cycle, and is very easy to use.I would definitely recommend it, and will follow up with any issues, if they occur. Long term, who can say how good anything is in advance?