I've been here two times both during lunch hour. The first time everything was slow, food took a VERY long time to make and the restaurant was not overly busy. The server kept spilling tea on me every time she would pour.
Second time, it wasn't very different from the first experience. This time I didn't need an umbrella.
This is a franchise, so other Aji Sais are different (read: better). I would recommend going to a different sushi place since there are so many.