It has been asked quite a few times… but no issues that I’ve ever experienced.
I’ve had to enable magstripe for certain establishments which don’t do contactless / PIN but it has still worked OK
Exchange rate - ONLY ever choose to pay in the local currency (USD in the US) and you’ll get the best rate. There is no ‘set rate from when you use it’ - it is dynamic and changes with the daily exchange rate changes.
Max gives you the Travel Insurance, discounted airport lounge access and fee-free cash withdrawals (up to £600 every 30 days)
Almost all as some are Visa only. Most will charge for withdrawals so might be worth getting Chase as they don’t charge in their own ATMs (which they have lots of in America).