Does Festool make the Zobo forstner bits in house or contract them out?

As someone who is just getting into Festool, I'm trying to understand what makes these bits so special and/or good?  Can someone give a quick breakdown of why someone would want these over some other manufacturer?
 
  • super sharp
  • interchangeable starting tips or twist drills
  • Centrotec system

That's 3 reasons off the top of my head.

Tom

EDIT:
The interchangeable starting tips/twist drills allow use in various situations and at angles.
 
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