They have like 8 locations in the San Jose metropolitan area, I went to the one in Cupertino, which is, interestingly enough, fairly close to town hall and the public library.
Another Taiwanese chain we have a lot of in the area is Gong Cha, which I kind of prefer over Happy Lemon.
In fact, the south bay area has US branches of a number of east Asian restaurant chains and retail chains. Like, in SUnnyvale, there is one of the two Bon Chon chicken locations in the US, they serve Korean Style fried chicken. We also have a few Yoshinoya locations (beef bowl chain), a couple of Daiso Japan stores, a branch of the Kinokkuniya book store chain and a few other Asian grocery store chains.