NE,
The Geckos are different than they standard climbers. I started with buck pole spikes, and have used the tree spikes as well. I'll never go back. It took some getting used to becasue with my old pole spikes I would stomp them in and my boot would be touching the tree, with the geckos the boot is off of the tree. having my boot on the tree or close enough to prevent rotation was the biggest thing to get used to. At first I gaffed out a bunch of times because I would swivel my foot a little too much. I think if i were coming from the longer tree gaffs this would not have been such an adjustment because they keep the boot away a little also. When I really like them is when I am blocking down a spar. They allow you to stand a little more up right and you can almost put your knees against the spar because of the gecko gaff design, where the normal style would always kick out if you got your knees that close to the trunk. They allow you to stand a little more upright and cause a little less fatigue when working down a spar.
Greg