My experience with Dave's company was first-rate from beginning to end. Everything was carefully explained when I booked, and they kindly offered to extend the October special on sanitizing an extra couple of days as we settled on an early November date due to street parking problems in the last week of October. On the day, they let me know they were on the way, and arrived promptly. They explained the entire process carefully, and were extremely careful with their material and wore shoe covers to protect the carpets and hardwood. I'd had the furnace cleaned two weeks earlier, and yet their inspection revealed that the drum had not been cleaned properly at all. They took photos, which I immediately sent to the company responsible for the job, and when the company refused to take responsibility over the phone, they offered to do it for me for no extra charge. The system was incredibly dirty, due to multiple reno work and years of neglect by the previous owners - I was horrified by the 'before' pictures, but totally astonished by the 'after' ones! They showed me the 'before' and 'after' particle readings as well - the difference was huge. The sanitization left the house smelling clean and fresh. They were efficient, courteous and extremely pleasant to have in the house - they finished more quickly than they had said, and the cost was more than reasonable. In the month since they did the job, it's amazing how much less dust there is! Dave provides an absolutely first-rate experience, and I highly recommend their services.