isnt brisket cheaper than chuck?
also, no need to marinade the brisket. Just season with salt, pepper, paprika, garlic powder, and onion powder. I have not done this yet on my SE#4 but on my MES40, I would stick it in there and cook it at 225 degrees for about 18-20 hours until internal temperature of 204 degrees. If you do this, cut some off and bite. I will GUARANTEE you that you and your guests will forget about pulling any beef or pork or chicken for that matter. Some of the best food I have ever eaten.