We did the fantasmic package in May, had a lovely meal at Mama Melrose.
I bought the package because i really really wanted to see the show after great reviews and I was worried if we hadn't bought the package we would have been left outside!! There was no other way to fit it in again during our trip so thought the package was the best idea.
HOWEVER I should'nt have worried, even five minutes before the show started there were still several seats left.
If I were you I would arrive at least 1/2 hour before show time (more if during peak season), grab a drink and something to eat and soak up the atmopsphere.
It is a FANTASMIC show, def not to be missed.
Have a great time