So, I bought these Z1 2 pc. rotors awhile back
Z1 - 2 piece Rotors - Sport/Akebono brakes (front)
When I had time off, I had them put on and almost immediately realized they were warped. Sean @ Precision Z (who installed them) said the rotors were warped as soon as he came back from the test drive.
The steering wheel shook when braking at speeds over 50mph and was much worse during high speed braking.
When I contacted the seller, he told me it was "track pad residue" and it would go away after bedding in my new brake pads..over 300 miles later it was not any better.
Anyway, I bought the rebuild kit, had Sean rebuild them, and now they work fine. No steering wheel shake whatsoever.
It's too late to get my money back from the seller but I wanted to let fellow members know about my experience with this seller.
My fault for trusting some stranger on a forum.