We moved to France 10 years ago, not because we were unhappy living in the Uk but because the opportunity arose, the children were the right age, both pre-school and it seemed like a good thing to do.
It was a good, if sometimes hard, thing to do. We've done things we'd never have done otherwise - renovated an old barn, had some wonderful holidays by the sea (atlantic and mediterranean which are a drive away), met some lovely people, French and British, found jobs, set up a couple of small businesses.