I booked with JustFly last summer after my friend referred it to me. At first I was hesitant, but when I started booking my flight, it felt so easy. I didn't even have to call customer support.
I went on with my trip to Edmonton. It was a three day trip and I never encountered any hassle with their services.
Sure, my heart belongs to FlightHub, but I may just give JustFly a high score once I book with them in the future.