This Starbucks is located in the central hall at known as "Kananaskis Hall" on the departures level (level 2) of Calgary International Airport. It's a full service Starbucks so really there's not much to say/know.
Pros: You get Starbucks at the airport.
Cons: You can't take it with you through security, so unless you're hanging out before going to your gate or just seeing someone off I'd wait until you're past security.
Another Con is of course the Airport premium, despite being before security you're still going to pay that airport premium that everything carries at the airport.
Lastly the service I got here was below average, one of the girls doing our orders appeared to be a trainee. I could see this being an ongoing issue as airport positions tend to have higher turnover.
So all in all it's not the best Starbucks, you'll get your order but it may take a bit longer and cost you a bit more.