I've been going to Duff's for over 10 years, though much of it was at the Bayview location. I don't recognize any of the staff at the College street location, unlike the original location but that's OK. The wings are consistent as are the multi-level of sauces. For anyone who has never been to Duff's, even if you think you can handle spicy hotness, beware of Death and Armaggedon - it will not only kill your tastebuds, you'll be living in the bathroom shortly after putting the wing on your tongue.
The ambience is definitely a bit more sport bar-like so be prepared to jump out of your skin when the Leafs score if your eyes aren't glued to the many TVs. A warning that they are pretty high up so prepare also for possible neck strain.
Duff's consistency: check! Yummy and pretty large wings: check! Good service: check! Not the cheapest place for wings - head there on Tuesdays for a bit of a cheaper deal and/or don't show up on a game night if you are looking to have a conversation with anyone at your table unless you like a cheerful din.
A great occasional indulgence!