I use the climbrite aluminum spurs. I love them. I didn't feel that the learning curve was bad. I walked in the woods and climbed 25ft up a tree the first time I put them on. I don't recommend that approach, but just just showing that it isn't hard to do. They do cause some damage to the tree, but so do climbing sticks, lock ons, bolts, etc... I used tree gaffs before, because they are longer, they may do more damage. Just switched to pole gaffs, maybe the shorter spike will do slightly less damage. Can't beat them for quickness, quietness, and versatility. Hike in, find a good tree, climb up and hunt. They fit in my backpack, lightweight. Private land, I won't use anything else. Public land, gotta go with the sticks.