its good timing you posted this now-i'm going to see them on friday night!
i've seen them twice before at free gigs and they were brilliant.They do all the in-between song banter "john" does jokes,"paul" falters when introducing songs etc just like at original Beatles concerts and they all speak in the scouse accents

plus they make in-jokes referring to real life incidents (Yoko,Allen Klein,Apple Corp etc) which being a Beatle fanatic I found amusing
Also what i like about them is that they dont just do early crowd pleasing dancey songs-they also do unexpected songs like "A day in the life","Strawberry fields" and some stuff from "Abbey road" usually too.Hope you have a good time!