I have a huge soft spot for this Toronto landmark (yes it is a landmark). I've been coming here to study for the vast majority of my undergrad and grad courses. This is pretty much the only library in the GTA to find old Moliere and French theatre costume books, Enquiries and studies on Economics research of workers and their equipment from the early part of the 20th century and European Municipal finance reporting along with their stats from the mid-70s.
The staff is knowledgeable and the A/C is cranked up in the Summer. If you're a film-buff, I'll have you know that a great deal of shitty, but high budget films have used the TRF as a set for a scene or two.
I wish they had longer hours though. It'd be super-forward thinking to have at least 1 library with long hours year-round.