I liked what I had ordered which was a Hawaiian which had bacon, pineapple, Swiss, teriyaki. My burger wasn't crazy large but it was the size I wanted. We had a variety of sides which consisted of Cajun cut chips, fries, bacon poutine.
This is the only Fat Burger in the GTA just north of Promenade mall in Thornhill.
While I wouldn't necessarily drive all the way to Thornhill just for this place if I'm not too far I would come back to try some of the different burgers.
For the price it is not bad since you can basically choose your size from small to super large over a pound and even more I'd you wanted. I give it an a-OK.