Spock is absolutely amazing to take out to tea. We often go out to a coffee shop and have a milk shake and she will sit there and chat away with you and have her drink etc. I do take her to ones with toys, and she will happily play with the toys while we wait for our order.
We go out probably once a fortnight for pizza, and she is fantastic, sits at the table eats, chats, etc... In the last month for so she has been choosing to sit in the 'big girls chair' instead of a high chair, and will still stay seated etc...
I have had compliments from staff about how fantastic she is, and how they would never dream of bringing their child out. I guess because it's just something we always did, eg we never avoided it its just normal for her... Not that we eat out really often due to financial reasons. But restaurants are 30 mins away here, so by time you get take away, being it home it is too cold to eat so we just always eat in