This is very high quality tool. Built very well. Designed very rugged.So far it has saved me many hours of setup time from screwing with edge finders etc. I highly recommend this for any milling machine. I have just the standard short probe. And so far this has been perfect. I can see where some setups may benefit from the long probe but it's a easy add on later.The only thing I wish it had was a high quality case to store it in my tool box. But that's no reason to not purchase this tool. It's worth every penny of $400