British, moved to San Francisco for work (actually an acquisition) in 2014. Still in the USA 7 years later, as are the rest of the team who moved over at the same time.
Financially definitely worth it - salaries here are so much higher even than London, not to mention stock options and suchlike.
California is a really lovely place to live. We saw a whale from our back deck once! It's November and it's sunny and warm outside. Very different from the UK!
Even with the best insurance plan we can find, interacting with the healthcare system here is so stressful that it's the main thing that makes me consider moving back again.