Peter and Valery and their crew are fantastic - we have a roof with some abnormal complications such as a turret and a flat section, but they were able to tackle it all quickly and thoroughly. We had 3 layers of existing shingles on both the house and garage as well as a pile of 'extra' pea gravel on our flat roof - a lot of material to take away since we wanted everything stripped off down to the wood.
On top of the massive amount of material to be removed, we have demanding neighbours who are home all day and kept a watchful eye to ensure no damage was done to their own properties (tight urban site with some delicate wall finishes like stucco). Kingsway Roofing managed to keep everyone happy and left our place and the neighbour's spotless.
We also had to have a mason in to re-build a chimney on the flat roof *during* the re-roofing work, and Kingsway was very co-operative with sharing space and access with another trade despite no oversight from a contractor or the owners.
The one area that might be a bit stronger is in communications - as an architect I had plenty of questions beforehand but it wasn't always easy to get a response. This is due to how busy Kingsway Roofing is, which is further proved by the fact that they took only 2 long days to do our house and garage (a total of 25 hours). Once on site, they were very comfortable fielding questions and even invited me up onto the roof to see things were progressing and take photos.
I consider them to be knowledgeable, thorough, and fast roofers and our quote from them was towards the bottom end of the quotes we received for the job (ranging $7,000-$21,000). I wouldn't hesitate to recommend them to my friends or family (and already have).