ive been to the lock up once, for some co workers farewell party... the drinks did even taste good, the food was alright (we mainly had finger food)...
downside: the drinks have been too weak...
and if you dont like entertaining, then better not go, i was pretty annoyed by getting interrupted ever 30 minutes, but i must admit that themed restaurants and anything like that is something i avoid...
if thats no big deal for you, i would just go, if i were you, especially if you got a few funny people who can join you... i didnt know about the entertainment part and thought its just a themed restaurant...
anyway, as far as i remember it wasnt even that expensive...