Ignore the other reviews! Its obvious that some people don't know their product before they purchase items such as this. You can't just see someone on the Food Network smoke a Brisket and then go out and buy one.
I purchased this packer cut brisket which weighted a little over 15 pounds. After trimming the fat cap down to 1/4" thick, I lost about 2.5 pounds. I did not separate cap from the flat since I have a large smoker. Had I separated the cap and the flat, then I most likely would have had more fat to remove as well, but that ends up being the best part as it turns into liquid gold in your mouth!
I highly recommend doing a brisket Texas Style. That means you only rub it down with salt and coarse black pepper. No oil, no mustard, no paparika... This isn't some pork butt, this is a brisket! Treat it with some respect!
I left this on the smoker with hickory and mesquite for 6 hours at 250 degrees F. I then wrapped the brisket in butcher paper (available at Sams's as well) and put it back into the smoker for another 6 hours.
If you are unsure about going with a time, get a good digital thermometer and check the temp every hour or two. You want to shoot for a goal of 185 degrees F. BEWARE OF THE STALL. The stall is normal, so don't be afraid of it. The stall is when the internal fat and connective tissues start to break down, causing the temperature to stall. KEEP THE TEMP AT 250 DEGREES. Trust the process!
Once the brisket hits 185 degrees F, you want to start doing the toothpick test. The toothpick test will let you know when the brisket is done. When you can shove a toothpick in several different places on the brisket, and it slides in like a hot knife through butter, it's ready. Sometimes, you may have to take the temp up to 190, 195, 200, or 205. Ever brisket is different, and this is what makes it an art and not a science.
Once it's done, let it sit for at least an hour. You need to let them meat reabsorb all of those juices that are trying to escape. If you can let it sit longer, that is even better. If you want, you can take it and place it into a cooler with some towels and it will help keep the temperature up, especially if you need to keep the brisket warm for a few more hours before serving. If you want to pre-cook the brisket the day before an event, that can be done too, just don't cut it yet. Heat and oven to 205 degrees and put the brisket in until it hits an internal temperature of 165 degrees. At that time you can then cut it and serve it.
Enjoy!