O'burger was a pretty decent burger place, as I came here for lunch with a bunch of co-workers in the past. The place is pretty busy and finding a seat is rather difficult, so it's best to try and make reservations ahead of time if you're looking to bring a group in. The decor is great and the place looks very modern. I really liked the picture frames and retro style seating they have inside.
The food is pretty good and I usually get the Hawaii burger along with sweet potato fries or a poutine. I must say the burger is your standard, and is similar to something you would get at South Street Burger or Five Guys. The patty, seems to be previously frozen over freshly ground beef, but it tasted great regardless. The sweet potato fries are pretty good, but I do find them to be a bit on the soggy side at times. The poutine here is not bad as well, but compared to other poutines you can get around the city, it's sub par.
Overall a decent place to go with co-workers on a lunch, but I definitely think there are better places in Montreal for burgers.