We've been living in the north Midwest for almost 3 years and are due to move home to the UK this summer... I can't wait!!! America is not the place for me.
Yes in some ways we are financially better off, we could afford a huge house with land and private school if we wanted to - these things are about twice the price in the UK.
BUT we are young(ish), fit and healthy and so is DD. I would not want to be older or ill in this country. We have full health coverage its still ridiculously expensive.
I would not want to send DD to school with th ever present and real threat of gun violence in schools (she's only 3 right now so not an issue, but it's one of the reasons we wanted to move home).
I don't particularly care for the lifestyle which is heavily car-orientated. Everything is so far apart you simply have to drive there is no choice. I'm sure there are some beautiful parts of the country but lots of the places we've been (florida, Ohio, Pennsylvania, NY state etc) all seem to look the same to me.... endless roads and car parks and ugly concrete shops (I LOVE beautiful period, European architecture and miss it so!). Seriously, WHY build it so ugly?!
We've been to some beautiful places - Cape Cod being one of them. But the wilderness really is wilderness over here. With bears, mountain lions, bobcats, wolves, poisonous spiders, snakes etc. Not to mention lone weirdos with guns. You really need to know what you're doing.
CA is obviously earthquake and wildfire zone (google the Cascadia Subduction Zone).
Also, like PP said upthread: your DC will think of themselves as American if you stay for a long time.
I don't regret coming here - but for us those reasons are financial and because we both have very dysfunctional families. The geographical distance has been an unforeseen blessing on both our marriage and our parenting and it has changed our lives in ways we could not have predicted.
I would have much rather had this experience somewhere like NZ though!