Zesty Slow Cooker Chicken BBQ (Or Pork)

This is my modified version of a recipe from Maceys. My modifications are in blue.
3 lbs boneless, skinless chicken breasts I used country style pork ribs. I think a beef or pork roast would work too. Why not?
1 18 oz bottle BBQ sauce
1/2 cup Italian dressing or 1/2 packet Italian seasoning mix plus 1/8 c. vinegar. (Dry seasoning is like 20 cents and makes 1 cup of dressing.  There's plenty of fat in the meat so I omitted the oil from the packet directions and used half the vinegar required).
1/4 cup brown sugar
2 Tbs Worchestershire sauce

Place meat in crockpot.  In a bowl, mix BBQ sauce, Italian seasoning and vinegar or 1/2 cup Italian dressing, brown sugar and Worchestershire sauce.  Pour over chicken.
Cover and  cook 3-4 hours on high or 6-8 hours on low. (I cooked my ribs on high for 6 hours)
Shred meat with 2 forks.  While you're shredding the meat, pour the liquid from the crockpot to a saucepan and bring to a boil to reduce. This will make a nice, thicker sauce. Return meat and sauce to crockpot.

Serve on toasted buns.