i have been to the 3rd ave, park ave south and soho locations....
i am pretty sure that the menus are pretty much identical.
i always get a pitcher of sangria, fresh quac and some sorta quesas....
although the menu varies if you want lunch, brunch, early dinner or dinner.....
i recommend the sangria, and the traditional margarita on the rocks.
as for atmosphere: obviously the SoHo location is trendier and more "celeb" spotting than others (i saw Eric Dane a.k.a. Dr. McSteamy there!!!). the Park Ave So crowd is more i-bankers and the midtown crew. the third ave location seemed to be the most grounded, and just there to eat a good meal.... nothing pretentious or superficial. maybe thats cause i was there on a sunday during brunch??