I've seen some of it. I probably saw most of the first season...some of the second. I wasn't overly impressed. The main reason I watched it is because it was on after The Closer and there wasn't anything else on at that time that I was interested in.
I really didn't care that much for Saving Grace overall. It was basically impossible for me to like Grace. The police elements of the show were just ok and nothing special. I really didn't even consider buying the DVD and I don't care about watching any more of the episodes either.