The IBEW local 17 has an apprentiship program teaches apprentices to climb without spikes, using the "set the line with a pruner and hip thrust" method. Only after they learn to climb and position using ropes are they introduced to spikes. I find that most smaller and a few larger trees can be climbed without hooks just as fast as with hooks. It just all depends on how the tree grows. It also depends on the climber and the foreman of the crew. Most older foreman are old school and believe the hooks are needed on all trees and let apprentices wear them when they dont necessarily need to. Other foreman see otherwise and will not let the climber wear hooks. I will say if I am removing overhang from a 13kv, open aluminum wire, with no good rigging options, a crappy tie in, with a rusty tin shed, a garden of expensive bonsia plants, a playhouse, and a dog in the yard underneath me, and an irrate homeowner yelling at me, I will have my hooks on. Again, to hook a tree or not in line clearance should be on a case by case basis, unfortunately that isnt always so. Ok, one more point to ponder- picture yourself workin for asplundh, relying on your job to pay bills and feed the family. Then asplundh prohibits use of all of your new climbing aids, ascenders, pullys, big shots, etc. Gives you a saddle, rope, hooks, pruners, and a saw to pull overhang with. I think many of you will put on the hooks. The point is asplundh banns the use of gizmos that help climb for liability reasons. We are not even allowed to use split tails. This is because they will not pay for proper training of these things.