Once you go probe, you won't go back.
Do you like manually touching off your tools? Or would you rather just push a few buttons? In process length varification and other uses as well.
For Instance...
If you have a small center drill that you have problems breaking, so you stand at the machine to make sure it does fine, so the drill doesn't get smoked when it starts.
with a tool probe, you could measure the center drill after it finishes, If it is broken the length will change and generate an alarm, If it is within your alarm limits Your cycle can continue on uninterupted (and unattended).