A true quality product and worthwhile every penny. I used it when walking the Presidential Range NH and wouldn't have been able to make it without these poles. The Internal lock systems is strong, compact, easily to adjust, and it allows to take the three sections apart so the poles can easily stacked in any backpack. There is no better system on the market than this.Also, I am convinced that Aluminum is better suited than the more expensive Carbon shafts. I Aluminum is strong, light, and allows to handle torque forces (e.g. when your pole is stuck between rocks) well.