[Dean]

Cast steel is mostly cast steel... All rotors come out of one of about 5 factories in China, Italy, Japan or I can't remember where. Company X buys those blanks, does the finishing and sells them.

There really is no magic in the OEM replacement rotors market. Subaru OEM rotors are as likely to come out of the same batch as these or any other OEM size.

Ground rotors are about as good and flat as you can get because if properly done, they are equally loaded while being "turned", so the material is not stressed or bent while being machined.

Cryo has shown a minor improvement in wear, but only if done slowly. Flash Cryo has not been shown to have significant benefit that I am aware of.

As I said, there is basically no low cost coating that can handle brake temperatures, so they will only look nice until you use them hard and then they will rust like every other steel rotor in the universe.

Since for the most part, "warping" doesn't actually exist, it is pad build up, so just be sure to bed your rotors properly.

So.... BUY THE CHEAPEST DAMN ROTORS YOU CAN FIND and don't pay more than $5-10/rotor for cryo if you really feel like it.