Quite well, actually. Thaw in fridge. If sliced, heat a little chicken or beef stock in a pan - just enough to coat the bottom - along with a small bit of butter. Lay the slices in, cover, done in a couple minutes (don't let the liquid boil, just a bare simmer). For larger pieces: if you've vacuum-sealed you can drop the bag(s) into a pot of boiling water and simmer for a bit; if not vac-sealed you can simply either place the meat in a small baking pan or roasting dish with or without the liquid/butter addition (I prefer the addition), cover tightly, and stick in a 300-350˚ oven, or just wrap in foil and place in the oven. Timing will depend on thickness but for chunks of brisket one usually figures about 20-30 minutes or so in a baking pan with liquid, a bit longer if foil wrapped alone. You only need an internal temp of 140-150˚ for a good serving temp.
Point makes terrific chili.
Usual caveat: if smoking whole and portioning/freezing later, make sure whatever you're going to freeze is completely cool before wrapping for the freezer for food safety.