I also did this; booked 7 nights paying in advance, and got the Olive Grove, which is popular, twice on boarding afternoon. Other nights I walked into the Glass House or the Keel and Cow and asked to be seated. One night I went for early dining in the MDR because there were 2 shows I wanted to see. Liked the bookings because I like to plan, but it seemed to work ok even for those who didn't.