This guy "David" claims on his website to be a member of the International Society of Arboriculture(ISA). I had a look as it is easily searchable on the ISA website and neither he or his company was listed. Stick with reputable tree care companies in the lower mainland.
I am in the Industry and have heard and seen poor workmanship and customer service on his part on several occasions.
The guy is just out to make a buck and has little or no formal training as an Arborist.
I wouldn't let this guy cut my lawn!!