I just got this probe this year. To be perfectly honest, I don't know why I chose to get the carbon version of the stealth probe. Maybe if you aren't teaching classes and using your probe a lot, you can get away with the carbon version, but after a couple of weeks of teaching awareness classes, this probe broke. It cracked and although it is still functional, it snags when deploying it on the wire. I was literally talking about how amazing this probe is when it happened...so I will definitely be getting the stealth probe again, but will not get the carbon version. The locking system is the fasted system that I have seen yet. Super easy to use, no wasted time, and a great probe. However, take note that if you are using this probe over and over again to practice or teach, you may want to consider the aluminum option.