Only been Amb for a few months, but my experience so far has been good. Haven’t gotten any special surprises yet but as a (mostly) business traveler those don’t matter much to me personally. But any time I reach out with a question about a property for personal stays my Ambassador has been ultra helpful and responsive (often within an hour, and never more than a couple hours) and either will directly reach out to the property to get answers or connects me directly with the correct people at the property. No complaints.