NColoradoAG said:
I have a BBQ Guru that I use when I cook brisket or pork shoulder. It's held up pretty well over the years. Don't use it for any other cooks as the Egg is easy to work with. It's good peace of mind for those overnight cooks where you want to get a good night's rest.
this is essentially what I use my flame boss for.
I'll put a brisket on my kamado joe with the controller set to 225 around 10pm and go to bed. Check the next morning around 8am and usually have an hour or 2 left to finish cooking. It stays right on temp all night.
On the other hand, once you get your vents set, the kamado stays very stable for a long time. I've done briskets overnight just as well before I got the flame boss.
Do you need it? No. For me, its some peace of mind so I don't worry about the cook.
Also, if you are doing a long cook, use the larger lumps of charcoal. The little pieces seem to smolder and smother the fire. The larger pieces allow better air flow.