To be perfectly honest, I go there to get day drunk and party with my buddies. I don't really care what type of commercial beer or craft beer they have. That said there's a massive selection of beer!
I usually start the day by trying to be sophisticated and try gimmick (craft) beer... but by the end of the afternoon, I'm hammered and drinking Budweiser or whatever else.
So whether you're just looking for a nice day drinking environment or you actually want to try new beers, this is the right event! There's all kind of music, food (although I'm too busy drinking to eat) and people. This is definitely one of the best summer events in Toronto!
*I was told Saturday is the best day, so I have only been on Saturdays and I'm definitely going again this year. Finally I would advise getting tickets in advance. Although there are loads of scalpers when you go in.