Come on How bad can they be? Here is the ad for their "newer" replicas:
• 100% Low Pressure Casting
• Lightweight Aluminum
Performance Products® proudly presents these alloy replica 5-spoke style wheels. Manufactured using water & air cooled low pressure casting equipment resulting in the strongest and lightest cast aluminum wheels on the market. This design allows us to manufacture a wheel only slightly heavier than a more expensive forged wheel. Finished wheels are then completely X-Rayed to insure quality and strength. Wheels come with black centers and a machined lip. All wheels are hub-centric with the standard 5x130mm lug pattern. Offsets fit 1965-89 911,912,930 with Carrera® or Turbo flares, 944 1983-86 except Turbo and 914-6 with GT Flares. Center caps and lug nuts sold separate.
http://www.***************/productpage.aspx?pid=111781&name=Alloy+Replica+Wheels