I received comments from someone, who has studied Ondes Martenot at
conservatory and has knowledge about the mechanics of the instrument.
He has also briefly tested the French Connection:
- "The ring was crappy (all Martenot or Ondéa use a ring that fits the
finger, different devices are used, but it is essential that the ring
perfectly fits the finger so that you can make a good vibrato.)"
- "The wire was made of plastic and kinda elastic, wich is not really
good for expression."
- "The "button" didn't offer any mechanical resistance so many
rythmical effects couldn't be produced."

Judging by some Ondes Martenot videos, it is easy believe this. But
like I said, I don't regret my purchase. Hopefully there will be French
Connection Mk II and other high quality alternative controllers in the
future...

Best regards
Jari Jokinen