Unlike most visitors to this type of restaurant, I tried the grilled cheese. I can safely say that the $3 I paid was too much for what I got. Two burger bun tops slapped together with nasty processed cheese in the centre? It was gooey is a gross way and made my stomach upset the moment I ate it.
I contacted head office to find out about their allergen menu... and then I contacted them again... and again. Three times and not one email back! Talk about shitty customer service! Well, what would I expect of a store that stores bags of peanuts out in the open and suggests that those with peanut allergies, "...don't come." (http://fiveguys.ca/en/about-us/faq.aspx#faqSection-2213)
If you want a GOOD, BETTER, BEST burger experience, hit up Hero Certified Burgers. Heads and shoulders above 5guys!!!!