We did a walk up at Tony's when they opened for dinner. Had the best service and food there then as well.
When we want to make changes to our plan and know we won't keep the ADR that we have for that day we always call disney dining that morning from the room to see what is available. We were able to snag a lunch ADR at Chefs last year on Christmas eve by doing that. Also we were told to come in at opening for a walk in because anything after that you might get turned away. Saw it work plenty of times when we were in WDW.
When we want to make changes to our plan and know we won't keep the ADR that we have for that day we always call disney dining that morning from the room to see what is available. We were able to snag a lunch ADR at Chefs last year on Christmas eve by doing that. Also we were told to come in at opening for a walk in because anything after that you might get turned away. Saw it work plenty of times when we were in WDW.