3 times with mediocre results - 4th time really bad! The sushi here is pretty expensive for what you get but this place is close to where we live and my family loves sushi so we wanted to give the place more than a fair shot in the hopes that it would improve. It didn't - the last time we went we found a piece of metal on one of the rolls. It was curly and a few mm in length. We brought it to the attention of our waiter and he didn't say a word. He simply picked it up and took it to the kitchen to apparently discuss it with the manager or the cook. A bit later when he brought the check he said that the manager thought it came from the Brillo pad that they use on the cookware. That was it. No apology, no offer to take that item of the bill, no visit from the manager, nothing. Perhaps I look like I need to increase my iron intake but it won't be from Koishi. There are far better sushi restaurants a little farther out.