Features:

• Dual precision-tensioned steel springs help create tension memory, applying uniform pressure along the entire blade length
• Aerodynamic wind spoiler creates downforce, preventing blade lift-off
• Exclusive FX dual-rubber-technology flex element resists ozone damage and hardening
• Exclusive weather shield connector system is pre-installed to protect arm connection from snow/ice build-up
• Smooth, quiet operation with 20% longer performance life vs. other premium wiper blades

Rating : - Great When new, Just don't bend them!
The wiper blades were replacements on my 2008 Cayenne because the 12-month old ones were damaged during normal cleaning of the windshield. While the pre-curved springs which are built into the rubber work fine while new, don't let them get bent or you'll have excessive chatter and streaking as the blades will no longer be completely square to the windshield.

Again, they work great and look good without the extra reinfrocements most makers use, but they are not the most durable...Really nothing you can do about that as it is the manufacturers design that dictates which blades you use....