I come to this location rather frequently for work and for personal purposes. In terms of customer service, there's always someone around to answer questions and usually when I'm looking for a section to try and locate a book, one of the Indigo team members has approached me and asked me what I'm looking for. They're rather knowledgeable and will do what they can to help!
I came in today and I had my headphones on, partially because I didn't want to be bothered while I poked around for the book I wanted. I like to walk around and see what they have in store, what's on sale, what's on feature... its a nice experience and usually better to do without being interrupted by staff :) I was looking for The Hunger Games and I saw it on my way in but wanted to see if I could find Game of Thrones as well. I found it rather quickly and some other titles that I wanted to price out.
In terms of the selection, I doubt there's many bookstores in Toronto that have the selection that this location has. I've shopped here for everything from kids books, tween novels, non-fiction, fiction, and non-book materials and have never had an issue locating what I'm looking for.
This particular store usually has some really good sale tables as well; at least one with non-fiction (usually one geared towards female readers) and usually one non-fiction table that's discounted (some DEEPLY discounted). The number of $2 books I've gotten from this location is absurd! You can't really go wrong with this location!!