Do not use these guys if you want your trees to look beautiful. They cut ALL the main branches off of my immature dessert trees. So, all my new growth will be in weak, 90 degree angles from the main branches that have been topped. They will grow up to look like this: http://sonorantreesvc.com/03/how-not-to-trim-a-tree/ (scroll down). If you want to see more examples of improper tree pruning go to http://sonorantreesvc.com/11/improper-tree-pruning/. Our tree has essentially been topped with some twigs left on. We are so bummed. Another article that Harris & Sons should read: http://www.angieslist.com/articles/topping-techniques-bad-trees-homeowners.htm.
On the positive side, the company was easy to work with, responded quickly to my call, and was reasonably priced. So, if you want your trees trimmed so that they don't need much maintenance, then Harris & Sons may be the company for you. Also, they helped my neighbor when a huge tree fell on his house during a storm. It was a very tough job, and they worked through a very hot day to get it all done.