Expatriate insurance?

I just discovered today that expatriate insurance exists. From what I've read you can get policies that will cover you while living or working abroad, usually for anything from six months upwards. Policies covering health, auto and personal property insurance are available and more. You do need to make arrangements to have it in place before packing up and moving though, not once you've arrived. Does anyone have any experience or knowledge of these policies and how they work? They sound as if they'd be worth investigating further. We've often discussed living abroad amongst myself and my siblings when we get to retirement age. The benefit I see to these kinds of insurances would be dealing with companies you know and terminology you're familiar with. I'd imagine that'd be more straightforward than trying to set it up in a foreign country. Any thoughts on it please?