I think it worked out very well. Strangely enough, 'Ohana was available (which we snagged) two times at a time acceptable to my family as dinner time - never before 5:00 and never after 6:30.
Granted, 'Ohana isn't a restaurant we have never tried before - but funny that it comes available closer to dinner time as people who booked it 60 days out and their plans got away from them begin to cancel (not once, but twice).
Rose & Crown, Tony's Town Square, Crystal Palace, the list goes on........... The only restaurants that didn't pop up with availability were prepays, like Cinderella's Table and the like, for obvious reasons.
I am not advocating doing this if this is your first time at WDW.