I've owned one of these for four years, and, for my purposes, it's been the best tool I've tried.  I use it to prune my grape vines (I have a small vineyard.), and I can reach to the top of my vines, which grow on an elevated structure of posts/wires that puts the vines up to 7' off the ground.  It cuts the vines cleanly, and quickly.  A also use the pruner as a harvesting tool.  I mount it on a 30' extension pole (5 section "window-washer" pole)so I can reach up into tall coconut palms (I tie 40' of braided nylon cord to the line that comes out of the bottom of the Pruning Stik.).  Initially, I used duct tape to attach it, but I have made a "fixture" using U-bolts and wood so I can easily clamp and remove the Pruning Stik to/from the extension pole.  The blades of the Stik slice through the thick stem of the coconuts easily, even the 1"-1 1/2" stem that holds a bunch of coconuts.  I also use it to harvest lychees, as it cuts the stems easily, and it is very maneuverable.  Sometimes there is a problem with the blades jamming, whether with thick or thin stems, but I've never had difficulty removing the jammed material.  The only negative I've found is that when cutting coconuts, and pushing the cutter between individual coconuts, if you aren't careful it is possible to knock the return spring loose.  Fiskars has replaced those for me at no cost when I've lost one.  I'm planning to get a few extras to have with me in the future, for immediate replacement.
I've owned one of these for four years, and, for my purposes, it's been the best tool I've tried. I use it to prune my grape vines (I have a small vineyard. ), and I can reach to the top of my vines, which grow on an elevated structure of posts/wires that puts the vines up to 7' off the ground. It cuts the vines cleanly, and quickly. A also use the pruner as a harvesting tool. I mount it on a 30' extension pole (5 section "window-washer" pole)so I can reach up into tall coconut palms (I tie 40' of braided nylon cord to the line that comes out of the bottom of the Pruning Stik. ). Initially, I used duct tape to attach it, but I have made a "fixture" using U-bolts and wood so I can easily clamp and remove the Pruning Stik to/from the extension pole. The blades of the Stik slice through the thick stem of the coconuts easily, even the 1"-1 1/2" stem that holds a bunch of coconuts. I also use it to harvest lychees, as it cuts the stems easily, and it is very maneuverable. Sometimes there is a problem with the blades jamming, whether with thick or thin stems, but I've never had difficulty removing the jammed material. The only negative I've found is that when cutting coconuts, and pushing the cutter between individual coconuts, if you aren't careful it is possible to knock the return spring loose. Fiskars has replaced those for me at no cost when I've lost one. I'm planning to get a few extras to have with me in the future, for immediate replacement.