Posting this because I read a hundred threads before we went and most were either "it's paradise" or "it's a soulless mall". Reality is somewhere in the middle and much more boring.
The bit people underestimate: school fees. Nursery through secondary, you're paying, and the good ones have waiting lists. We put deposits down before we had a flat. Budget for it properly, then add 10% for uniform, trips, bus.
Summer is genuinely hard. June to September you move between air-conditioned boxes and the DC get cabin fever. Most families we know go back to the UK for six weeks. Factor those flights in.
Housing: rent is usually paid in one to four cheques upfront, so you need a chunk of cash on arrival. Communities with shaded parks and a pool are worth more than square metres, we learned that the expensive way.
The good bits are real too. DH's commute is 20 minutes. The DC cycle to their friends' houses. No one blinks at a baby in a restaurant at 8pm. Healthcare is fast if your insurance is decent, so read the policy properly.