If you are an antique buff, this show is for you. For the rest of us, I think it'll hold your interest for about 10 minutes. Especially if there's something interesting being appraised on there.
But making it through the full hour? No, it starts feeling really repetitive after a while. And the general feeling gets to be: "Yeah that vase is worth is $10,000. Wow. So what?"
If you like History channel or educational programs, it might be worth checking out too from time to time.