Loved it! It was like working in paradise!
We came here as part of a business meeting to work and write for a few days. I fell in love with the place after one visit. Historic and beautiful, it's like working in the 1920s (with speedy wifi). The coffee and food is outstanding, and the service is efficient and friendly. We particularly enjoyed working in one of the pods, which blocked some of the noise from the outside. However, it wasn't claustrophobic at all, since the roof of the pods are open, allowing for a view of the beautiful ceiling.
A worthwhile tip - there are meeting rooms that can be rented (I think they start at $25/hour), which looked quite nice and are cheaper than similar meeting space in Montreal.