This is a very nice location compared to a lot of the other stands at York Mills Centre. Unlike the Timmies, this Starbucks is actually very spacious and has a lot of seating to choose from. Not that it's a big deal since the food court upstairs has a bunch of seating already, but if you'd like a quieter space to work, it is nice.
I came in the morning and it was pretty busy, but the workers are all very fast so don't expect to wait that long! They're also very friendly. At least, the lady who served me was.
It also seems like it would be a nice place to hold a meeting with co-workers or bosses. There was a group beside me who did just that, and one of the men expressed his surprise at the heated underground parking (I'm sorry, I couldn't help but overhear. I swear I wasn't trying to eavesdrop!)
It's also convenient for people who don't drive, because it's located in York Mills Centre which is part of the subway line.
It's a nice place. I would definitely come here again while I'm travelling and need to kill time. Plus, they have free Wi-Fi! But I mean, who doesn't have that these days.