I've decided the Danforth is my favourite standing concert venue.
The sound is good. The ceilings are super tall which makes the space feel bigger than it is. The floors slope down slightly towards the stage which make it easy to see from wherever you are. It also seems to be more well-ventilated than some of the other venues, it was nice and cool when I was in there for Cut Copy the other week. Also seemed easy to move around, we were off to one side about midway between the back and the stage, it didn't feel crowded even though there were a lot of people around. Coat check and drink prices are reasonable, maybe even a little cheaper than other similar venues.
Can't wait to go back for another concert!