I've been about 5 times. It is a lot of fun but may be a little more grownup oriented. You solve a murder mystery while eating a prepalated meal. If you go, pay the extra for the prime rib, at least that's what our tablemates who didn't said. There is audience participation and at the end, all the people who solved successfully are given a chip from a bag. Whoever gets the blue chip (me in Jan '09) wins the big prize. Ok, it was a slightly oversized magnifying glass.
I really like Sleuths but my favorite dinner show not on property is Capone's, which is somewhat cheaper, has a speakeasy type show and an Italian-American buffet that is really good. Both include unlimited soft drinks, beer or wine.