It's the lock-on. It isn't designed to be a mobile setup, so it's a pain to get secured to the tree even using my linemans belt and having two free hands. And yes, it's a struggle. It has two upright posts so it's not easy to hold up one-handed, and the weight bearing strap attaches to these two eyelets via hooks that like to fall off and go clanging down the the ground........ look it's just a pain ok? XD

With a saddle, get to the top of my last stick, cinch a platform on the tree, throw the tether up, clip in, take off the linemans belt, done. Way quicker. If you're using a LoneWolf or a bracket system for your lock-on I could see how the saddle wouldn't save time setting up.