The Aero II Monoblock wheels in 17" weigh approximately 24.5 lbs. The AMG wheels are not notably light weight but, are definately not excessively heavy either. The weight reduction that you are hearing about is called unsprung weight and does dramatically effect performance and horsepower. availability.
Thanks, Luke

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Luke Pavlick
Performance Specialist (ASE Certified Master Tech)
Please, call me to place orders (800-428-8355 ext. 362)
or mention my name for on-line orders
(click banner at top of the page
to visit Tire Rack web site)