The only thing you need to know about crimpers is this: you need every crimper ever designed by anyone, ever, and then there will still be times when you don't have the right crimper. The problem isn't the crimper, usually, unless you consider yourself the crimper, the problem is the incredibly poorly designed Molex connector. Think of it as the Adel clamp of electrical connectors. A chimpanzee could design a better connector in about 30 minutes......