I have to disagree with 5 oclock about unwrapping the meat when IT is reached. Leave it wrapped for the rest. The magic happens while resting. As for checking with probe? Dirtsailor has had them done at 185 so start checking early. I have never had one done below 195 and I never pull, only slice, but thats a good reason to start checking early. Different meats, different techniques, different therms...... all make a difference. With brisket you need patience. If you pull it too early you lose a lot of the tenderness and sometimes can get an expensive piece of cooked shoe leather. One last thing.....that 1 1/2 hours at 225 usually is optimistic. With stall and rest 225 tends to be 1 3/4 or thereabouts. Another reason to cook at a bit higher temp. Gets you done quicker and helps drive you through the stall. Always good to be done earlier than having people waiting to eat, cause if they're waiting you are going to pull early and everyone may be disappointed. Finish early and its ok because brisket, if tightly wrapped, will stay for several hours and still be hot and delicious.