The TimEX3 board is now in use at SOLEIL. It was designed with the open source EDA KiCad.
Overall, our experience with KiCad was positive. It was easy to learn and to use, especially compared to some commercial software.
We didn’t encounter any major problem or bug and the development of the board progressed almost flawlessly.

Today, KiCad lacks some functionalities to be able to fully replace a commercial software like Cadence or Mentor.
Based on my own experience, I would mention:

• Better components creations
• Differential traces management
• Better same length traces management
• Better router (auto-routing, push and shave, etc.)
• Stitching management
• Some other improvements

Nevertheless, KiCad can be used in a wide range of projects, and I would definitively advice anyone to give it a try.