At the Albuquerque symposium I tried every hollowing system there. They all worked really well. However the main difference was that most of them had many moving parts, especially elbows. Every moving part on a machine is a great place for something to go wrong, bend, get out of adjustment, or break. The real beauty of the Jamison system is that, except for two steel bars sliding over each other there are no moving parts. I suppose the bars will wear out eventually but not in my lifetime. If you keep the parts from rusting and spread a little polish or wax on them they are as smooth and easily to operate as anyone could ask.