Bloor Go/UP Station suppose to be transfer station along the Bloor Subway line to UP Train to and from Toronto Pearson.
I like nice TV that display time for the next train. There is a ticket counter but only staff during rush hour so you really you and the ticket vending machines most of the time. And of course if you are paying with Presto Card the process would be so easy just make sure you tap on and off when you enter or exit.
The walk to or from Dundas West Station is not the most pleasant experience as you would have to walk through some narrow sidewalks and a sketchy area who might be a little scary if it is late at night. If you have a lot of luggage, I would not recommend that.
Hopefully that supposed to be build covered walkway will be ready soon?!