Very tasty. Goes over well with everybody I've served it to. You can change it in several ways according to your taste. I usually skip the pimiento, and add extra cheese. My sister makes this recipe using a cup of croutons stirred into the casserole and more on top, and she uses colby jack instead of the swiss. You can also add more onions if you like, or some different spices for flavor. Leftover chicken is fine, or you can used canned. Even my kids will eat this one. I never liked celery when I was younger, but I would eat this because it tasted yummy.