Latest example is Airbus resurrecting them, but primarily as a means of increasing effective wingspan without physically extending it beyond the 80 metres footprint permitted under current airport standards.
Cierva were doing quite nicely leading up to WW2. From all I've read, it was the outbreak of war and the accelerated development of helicopters that impacted on them.
I recall standing at the Coltishall control tower to watch a passing out display by a Lightning course at 226 OCU in the early 70s. Didn't last very long, but for sound and vibration it was certainly impressive.