We just did the Balcony Buffet on our last visit and it was a blast!! It is pricey - $49/per person and no discounted price for kids. It is the balcony by Disney Gallery and only seats about 21 people. You get a great dessert buffet - I remember Black Forest Cake, Cheesecake, a Chocolate Cake, some sort of warm apple thing, cheese and fruit and drinks - Lemondae, Hot Chocolate, Coffee, etc. The seats were unbeatable - directly across from Fantasmic! so you were front and center! There is also reserved seating at ground level a little more towards the side. The adult price is the same, but they do give a discount for kids (sorry, don't know what it is). They give everyone a box of desserts - I believe they include rice krispy treats, Mickey shaped cookies and a few other things. To get reservations, you have to call 30 days in advance of when you want to go (no sooner) and call right at 8 am - shows sell out fast - especially the 9 pm showing because you get to stay on the balcony to watch the fireworks. The number for information and reservations is 714-781-4400.
Enjoy!