A recent renovation has made this my favourite library branch in town. It's bright, open, and inviting. Lots of comfortable chairs to sit in, plenty of desk space, and free WiFi. I think they did a great job incorporating the new addition with the original brick building.
As for the books, I can't really comment on the selection as I usually go with a specific book in mind and have never browsed the collection before. But, it's pretty much irrelevant anyway because:
Pro Tip: The Toronto Public Library website allows members to order books online and have them delivered to any library in the city. With a service like that I don't see any reason to buy books anymore.