I've smoked "choice" brisket in the past and they aren't bad but I started smoking 'prime" brisket from Costco and the prime is definitely better .. and more costly. I try to maintain a cooking temperature of around 225 degrees and I smoke my brisket until I get it probe tender .. usually around the 200 to 205 internal temperature of the meat. Sometimes I wrap and sometimes I don't. I don't really notice much difference with the meat other than it cooks a bit quicker when wrapped. I never rely on time for when to expect my meat to be done. I generally smoke brisket around the 14 pound area and have had them finished anywhere from 14 to 18 hours. Smoked meat is done when it is done and you can't rush the process if you want a quality product. Give yourself plenty of time and if it is done earlyer than you want just wrap it in towels and put it in a cooler and it will hold its heat for several hours.