I have. I hated it. The mountains are beautiful of course, but the people are awful. You know all those things you've heard about the French - rude, arrogant, snotty, etc.? I did not find that in France, but I did find it in Switzerland. And everything is exceeding expensive.
I lived in Geneva briefly. I never found the Swiss to be rude. A bit distant, but not rude or snotty.
For that matter, outside of Paris I found the vast majority of the French to be quite nice. Parisians are A-holes.