I just changed out a old Metz that came on the bike when I bought it, with a new d404.
Big difference in handling. She holds the road much better and stays on track, way better.
Could be cause I'm comparing new to old, but the Metz still had tread.
I've changed probably 5-6 front tires myself, never had to remove the rotors. This time, the rotors were some aftermarket brand x that also came on the bike from the PO.
While balancing, I noticed a warp in one.

Pretty sure I did it, just don't know how.
Luckily, I also got the OEM rotors with the bike, mic-ed them up, (4.6 I think) and installed them.
I've never damaged any OEM before, and there a large dif between them and the pos aftermarket ones.
When I need new, it'll be OEM!