On a recent pub crawl I led, this was our final stop, number 6 of 6. I say we ended on a high note.
If I had a local, this place would be it even if the Wren and Sauce are more local.
I have been to the Only long before I moved to the Danforth. It has hosted one of my worst Toronto dates ("but I got a great story out of it!"). The beer selection is one of the best on the Danforth. The back patio is wonderful. And the crowd is good. I don't feel like there are many places a mid 20s-mid 40s guy/gal can pick up east of Pape but this one might be one of those places.
I have only ever been here for drinks and only ever for beer. As mentioned below, it is a bit cramped and dark...it is the kind of place you can get and be drunk in if that makes sense.
Highly recommended--even if you have to cross the Don to get here.