I put a set of Crays on my 2016 C7 Z06 after the factory wheels cracked and I got nowhere with GM, but this is another rant...
Purchased the Crays from a custom auto shop in Calgary. As for the Crays, they were on my C7 for 3-years, about 30,000 km and held up well. My major complaint with them is the rims stick out an extra inch and would rub on the fender lips when you hit a bump in the road. After 3-years / 30k the tires had very noticeable grooves from the rubbing. I tried multiple times to speak with Cray about this matter and got zero replies, so their after sales follow-up stinks IMHO.
But the Cray rims didn't crack like the factory ones did at around 6,000 km.
If I was to do this again, I would find rims that match the size and offset of the factory wheels.
Sold my C7 last month with 60k on it.