Plenty of things to see, some small (one room), some will take up to an hour each (treasury, armory). Good for a dreary weather- mostly indoors (except the garden). The all-day ticket is great, or you can find yourself a nice english guide or audioguide. Wi-fi in many locations, if you can't wait to post your photos.
Staff helpful, plenty of restrooms around, places to eat too.
Good with kids.
Just make sure to exit that dragon cave before the XX:00 time, to see the finishing touch.