We've fitted a few of these into Raven and I must say they seem to work better than the cig sockets. As an example we have a cig socket 12v shower that constantly tripped the cig socket breaker. Now with two pin plug we have zero problems. Same goes for 12v vacuum cleaner and inflatable pump. I suspect the two pin socket/plug makes a better connection but as Prairie Rose mentioned adequate wire size is most important.
“Give a man a fire and he's warm for a day, but set fire to him and he's warm for the rest of his life.” Terry Pratchett