I recently had to change all my adr's made at the 180 mark from 3 to 4 people (we are now bringing my niece along for her first trip to Disney). SInce we are normally seated at a 4 top anyway, I figured it would not be such a big deal - I was wrong. For many of my adr's it was not too big a problem - I was able to keep ma y of my original times or get one within 10 - 15 minutes of the original. But for Le Cellier, 50's Prime Time, Sci FI and Teppen Edo I had to switch from dinner to lunch (but at least I was still able to keep the reservations). Not bad though considering I had 16 reservations to change. The CM on the phone was very helpful and explained to me it had nothing to do with table size you were booked at, but maximum capacity in the restaurant at any given time. I would call and talk to a cast member though, because sometimes they can work magic =) Good luck!