if it falls off the bone you have over cooked them.
google for info on KCBS judging for more details.
the meat should resist a little, like al-dente pasta.
al-dente: litterally meaning "To the tooth" as in, gives a little bit of resistance.
when you pull the meat off the bone (with your teeth) the bare spot should dry quickly. and the bone should not be squishy.
There should be a nice pink colored smoke ring to the outer portion of the meat.
I am Q-ing this weekend. I will take more photos.