I did this method last weekend. I bought a prime brisket from Costco a few weeks ago and when I went to get it ready for a traditional smoke found out it was mangled at the processor. Had a couple gouges in the side and a huge gouge down the middle opposite the fat cap, plus a couple bald spots in the fat cap. It's what you get grabbing the last brisket available in the cooler. So I froze it and figured I'd try this method when I had an extra day on Memorial Day.
Thawed the brisket completely and then seasoned with usual salt and pepper rub, plus a 1/2 teaspoon of prague powder #2. That's all I had so I went light with it to be safe. It was a 14lb brisket trimmed.
I cooked at 155 for 24 hours in my cooler rig with the Annova. I pulled the brisket and let it sit on a wire rack to dry a bit for an hour. I also reapplied a 1/4 cup of rub to replace what was lost to the bag. Then put the brisket on my egg at 250-260 with post oak and pecan. Cooked it for 3 hours on the smoke. I sprayed the brisket every 20 minutes with a mixture of pickle juice and apple juice. I was drinking the entire time and forgot to temp the final brisket. I would imagine it got to about 180-185 during the cook. I let the brisket rest for an hour before slicing.
I gave the final product a 7.5/10. I was pretty blown away by how good it was. I think I could improve it significantly too. First, a little more rub applied before it goes on the smoke. Second, an hour longer on the smoke at a lower temp. I think both of those would improve the bark. You definitely want to keep spraying it to keep the surface moist to improve the bark and smoke ring. Lastly, I think just starting with a better beginning product would make a huge difference.
Next time I can get my hands on two briskets Im going to do them at the same time with one traditional and one sous vide and see how they are side by side.
This method was great because it's so hands off. I use a BBQ guru so already sleep pretty well when I cook brisket. But there was no dealing with putting it on at night or super early in the morning. No leaving a cooker unattended while I played nine holes of golf. No dealing with wrapping. No adding more fuel. No worrying about the exact moment it would be ready.