I've only been to KHH once but I absolutely loved it. Can't wait to see a Bonvoy property down there.
When I was there I stayed at an IHG property and used points. I was mid-tier elite at the time and they gave me a fantastic room with a shower larger than most NYC hotel rooms.
I recommend that anyone who goes to Taiwan takes the fast train down to KHH from TPE and enjoys at least a weekend there (unless flying to KHH directly, obvi). I only spent two full days and could have easily spent four.
-RM