Had a 10 dollar combo from here, it had yam sushi, 3 pieces of salmon sashimi and 3 pieces of salmon nigiri. It was okay, the salmon was reasonably fresh though I felt that the yam sushi was a poor excuse for a sushi as it's purpose is literally to fill you up with the rich, starchy yam. For the record I actually quite liked the yam sushi, it was savory and sweet and when dipped in soy sauce had great umami flavor.
The salmon nigiri are quite small, normally I complain about nigiri sushi having too much rice, these nigiri have too little of it, a tiny boat of rice with a long tail of salmon. The waitress and owner are both very friendly.
Perhaps I should have tried the hyped lunch specials because for a 4 star yelp establlshment Qi sushi failed to impress.