I stumbled across this 2008 WatchTime article while looking for information for one of my chronographs. Of particular interest to me was learning about what modifications were made by Alfred Rochat (AROLA), La Joux Perret, Hublot, Panerai, Polijot, Revue Thommen, Sinn, IWC, Frank Muller, and SOPROD: some adapted by ETA. In-house movements are valued highly here over "ETA" movements but this history puts certain facts into perspective. It seems its very success has been its downfall at present.
AROLA - Alfred Rochat & Fils