I would give this place a rating of 3.5 stars. 4 stars for morning/afternoon dim sum and 3 stars for dinner.
For dim sum, Kwan has slowly become my go-to place for dim sum in the Toronto downtown/midtown regions. Yes the prices are higher than popular Chinatown places like Rol San but you get significantly better quality. I would also rate the dim sum at Kwan over the notoriously overrated and overpriced Crown Princess in downtown.
As for the dim sum itself, one of the most pleasant things about it was every hot item came out steaming hot. This is a traditional foundational principle for dim sum; many dim sum restaurants nowadays seem to neglect this and serve lukewarm siu mai and shrimp dumplings. The dim sum here is also less greasy and oily than most places- perhaps this is due to the fact that a large number of their clientele are non-Chinese. Nonetheless this was another positive for me. It is also evident that they have a strong dim sum kitchen roster as some of the dim sum items are delightfully innovative (compared to Crown Princess for example).
Some things that they can work on- a wider selection in tea choices. I tried to order chrysanthemum tea a few times and they didn't have it. While their tea is definitely superior to Chinatown restaurants, it isn't anywhere close to top quality and there is definitely room for improvement.
As for dinner, I found it quite overpriced. The food is certainly decent but nothing special either. I would rather pay a little more and go to a place like Luckee.
All in all, I would say this is a solid Chinese restaurant and is quickly becoming my favourite affordable dim sum place in the city.