We visited Oishii sushi a few days ago with a Groupon voucher that we bought previously. Though it said that we had to present the voucher by paper (printout), upon calling and asking, they said that it is okay to bring it on your mobile phone.
When we arrived, we were quickly seated and we told them that we had the Groupon voucher. After checking/validating the voucher, we were brought menus and the waiter explained how the Groupon prix fixe worked.
We got: soup to start (miso/seafood miso) for 2, an appetizer of our choice up to $8 (more expensive ones were available for an extra surcharge), a special maki to share, and chef's special plate of 25 pieces of sushi.
We were pleasantly surprised at the quality of the food and the maki. I love maki, and I was extremely satisfied with my chef's plate which included 5 types of maki with 4 pieces of sushi. Though the quality of the fish used wasn't the most fresh, their maki and sushi selection was great and I'd definitely return again for another great dining experience with or without my Groupon voucher. I'd recommend this place for those who are looking for some good Japanese sushi in Montreal!