I'm running a drewtronics probe. I would say I'm about 90% happy with it. It is usually withing about .0005". I give it 90% because it will occasionally be off by about .003" My work around it to set up my WCS with the probe. Then I reprobe it and if it is within .001" (usually it is and way more accurate than .001") I know it did not have a random sticking issue.