Bob,
I know it would be good. Lately I've been getting the corned beef in a package at Sams Club rather than making it from an unadorned brisket. It is a choice cut of brisket and it is the flat portion. Works great on the WSM if you want to add smoke and make a pastrami, but another way to do it is on a gas grill. My Weber Genesis Silver B works great for this.
Here's how:
Sauce
1 Tbs butter
1 Tbs olive oil
1 med. yellow onion, minced
1 TBS garlic, minced
1 tsp caraway seeds
1/2 C. ketchup
1 C. beef broth
1 pint beer/stout/etc.
3 TBS balsamic vinegar
Cook the onion, garlic, caraway 5 or 6 min. Add ketchup, broth, & bring to simmer. Add beer and balsamic. Simmer.
Sear the brisket on both sides and put it in a cast iron skillet. Add the sauce so that it fills the skillet 1/2 to 2/3. Grill over indirect low heat for 3 to four hours. Add more of the sauce if necessary.
This recipe is found in Weber's Big Book of Grilling, p. 123. It calls for a rub on the brisket but I have not done so when using the gasser and a packaged corned beef.
Either way you go, brisket, corned beef, pastrami on the WSM or Weber gasser is very good.
Richard