I can confirm that swapping out the safety spring totally changes the stock mushy safety to a positive clicking safety. It was a $4.00 upgrade.
But I was looking at that Cajun safety because I find that my thumb is too short to comfortably engage the stock safety without adjusting my grip. Will this Cajun's safety help make it slightly easier for me to swipe on-off? Does anyone who has had this installed notice that it shorts the reach?