I've done a few for special occasions...given the price. Each time I've been very pleased with the results.
There is still some trimming to do, but not like buying a choice or prime from other sources.
I typically do these overnight so if I'm awake and alert for a bit, I'll start off at 180, but more often than not, it's 225 to the stall and wrap for the rest of the ride. I did not need to mess with tallow injections or any special tricks as these things are loaded with marbling that melts beautifully. I did try injecting the flat with beef broth a couple of times, but I'm not sure it really mattered.
I did cook one several months ago to feed all of my guys at work. A true BBQ snob even admitted it was in the "Top 3" briskets he'd ever eaten.