One other family stayed as well for 5 days. This was the first
ABD that we stayed for post days. Because it ended in Hong Kong, I think it was a good idea. It gave us some more time in HK
Disneyland which we both enjoyed and more time walking around the city.
This was the first ABD we had stayed for post days after the trip, but I think it's helpful here in Hong Kong due to the limited ABD touring time in the trip. ABD excels at taking you to the small towns or more out of the way cities and coordinating transportation and activities. It's not quite as good at the big cities at the beginning or end of a trip. For example, we didn't see much of Paris where the France ABD ends. Also, we didn't see much of Saigon where the SE Asia ABD begins. That's fine with me though, because you have the option of making the total trip longer if you want by adding the pre or post days.
For my trip next year, they only stop in Sydney for a couple of days, but it's in the middle of the trip. So I'm trying to decide if it's worth flying to Sydney before or after the trip and for how long. Logistically that's not quite as easy as say just staying at the same hotel in Hong Kong.