For a place that's been rated as a top T.O wing place, I was very underwhelmed with Duff's. Let's start off with flavour options. Unlike places like All Stars or St. Louis, there are under 20 options (mostly gradations of Hot, Sweet, and Dry Lemon/Salt rubs).
The service was friendly and fast, so that's a plus. The wings themselves were standard size, definitely not big or juicy by any standard. My biggest issue is with the hot sauce. They claim that medium is hot, and hot is very hot. Nothing could be further from the truth. I actually ordered their Armageddon sauce to see if that was any better, but at $3ish, that just tasted of more vinegar and hot peppers. In general the sauces lacked complexity. Won't be going back.