May be a touchy subject. It seems that I have run into more companies that dont climb or wont climb difficult trees. In the area that I work out of the 8 tree services only 2 will climb very hard trees my company and the other is the biggest tree service in the area. I have noticed this not only locally but my family lives in Fort Collins CO. While last trip out there I had to cut a Cottonwood down for my sister. Every tree service that looked at it said the fence would have to be taken down and they would have to drive across the garden (bucket truck) other that one but there price was $2500 and they would climb it. The tree took me about 7 hours to get down and saw everything up. I picked up a few other jobs while I was out there all Cottonwoods. The couple of other jobs that I did while out there after I gave them a price they told me what other people had quoted them. One tree was quoted at $1000 by on company and that was the cheapest they could find. I did it for $500 it took me 3 hours. The other job was another Cottonwood did that one for about half as much as anybody else quoted and hauled all the brush away (no chipper, huge pain) which added about 3 hours to the job and I still managed to make $125 per hr. I get call about once a week from other tree services in the area wanting me to climb a tree or two for them, sometimes I will do it sometimes I wont. It is easy to climb but give a guy a large tree with 14+ inch braches hanging over houses, power lines, decks, Flaggstone patios and all that fun stuff (not the limbs that are 20 feet above them, the ones that are 6-12 feet above them) and that's where you can really tell true ability.