As someone who has lived in California, I had accepted that there was not quality dim sum in Madison... until Nani. The flavors and selection are good and definitely within a reasonable standard of authenticity. We sampled all of the 'typical' items like Shu Mai, Har Gow, as well as a 'menu' time (one of the seafood based chow mein dishes). The other half of our party had been to Nani multiple times and vouched for the consistency.
Other comments:
-No push carts that rolled around the restaurant for guests to order from. Dishes are chosen via a picture menu and ticket slip (indicate quantity, etc.) taken by the server.
-Dim sum is served all day, everyday. (It does not convert to a more traditional HK / Cantonese - style restaurant during evening or weekday periods like you might see at other venues. Maybe hoping to be the Yank Sing of Madison?... )
-Prices are within reason but not cheap - similar to what you might expect to pay for decent, ethnic food in Madison, but more than an urban / metropolitan area that has an Chinese community.
-We ate on a Sunday evening and we were the only party. The returning visitors in our party mentioned that's usually been quiet. So hoping for the word will spread and for Nani to keep making quality food....