Are the festool bits worth it? As far as quality and convenience, for me Yes. As far as daily use on jobsites, questionable. As far as letting others use them, absolutely not.. I like the Centro bits for installs, clean, convenient drilling. Overall though for jobsite work festool accessories are too expensive in my book. The tools are expensive but they pay for themselves. Buying the accessories regularly takes too much money out of the job. If I'm at HD buying materials, I can pick up a Bosch or Irwin multi pack of bits for 20-30 bucks. Some will not survive the job, others will come to the next job. For $20-30 I don't really need to care whether the bits survive or not. In rehab there are too many nails, etc hidden in wood to rationalize using festool bits. In the shop, in known product I prefer to use them.