I have an older East York house with a smaller attic and mostly flat roof. I had to check something in the attic recently and noticed that the previous owner's "blow in insulation" efforts only covered about 30-40% of the surface area in the attic, leaving the rest exposed.
After reviewing DIY options and the challenges of my attic, I decided to get professionals in to do it right once and for all. After searching around I found the good reviews for Zenic in particular some comments about working with tight confines and flat roofs in older Toronto houses.
The Zenic crew of consisting of the owner and two helpers (family I think) showed up right on time and were very effective at getting the job done. For my small attic, the minimum charge applied with no "extras" and they were in and out within an hour, leaving the house cleaner than it was before.