I agree with Mike - the only way to find out if it's worth it or not is to try it. One person will think it's worth it, while another will think it's not.
Personally, we always try the specialty restaurants not only because we want to, but because we have to be able to tell our clients about them. And I can honestly say we've never been disappointed. To us, the extra cost is worth it. But others will think they've already paid for all their food, why should they pay extra just to eat in another restaurant?
Now with that said, while we really liked Sabatini's alot, we really loved the Crown Grill.