The Manson gauges I compared against were the down and dirty CIP. There was a slight difference in the Manson CIP No Go vs the ZPV No Go. This is only an observation, both sets work fine.ZPV is great quality. Remember gauges over here are going to be sami and stuff over sea's are going to be CIP. I prefer to use CIP since that is what the original people used. I have used their stuff and it is good to go but will take a bit to arrive as it is coming from serbia.