We did one in Boston about 15 years ago. The actors were a group from New York. If the gun in the first murder were real, I wouldn't be here telling you about it. I was in a direct line between the door opened just wide enough for a black gloved hand to reach through and the first murder victim. I think there were a total of three murders through out the week-end. Our awesome waiter was arrested during breakfast the second day. The person who got the most votes for being the murderer was actually a paying guest like we were!
We had an absolute blast. We have tried several dinner theaters and felt very let down. You knew who the actors were and just watched them put on a play. For a good part of the week-end murder, we were never sure who the actors were. As I said, our waiter was arrested. The Boston PD even handcuffed him and walked him through the hotel lobby to a waiting police car. The paramedics took the victims out on stretchers.
If you love mysteries, go! Keep your eyes and ears open. And most important, suspect everyone!