I had Pure wheels once... on a Jamie Thomas toy machine deck.... so you do that math on a time line.... anyways, they were absolutely horrible, barely rolled even on day one... serious, and I had good old loose German bearings in them... as they wore down a second layer was in them, like they hid plastic in the centre and then put horrible urethan over them... but it was not a core wheel, just a mix of materials.
also I had a a set of gold wheels, I bought them for the shape... and they just didn't have speed. They felt like a wheel on a K Mart deck.. and those were with Swiss bearings. I don't even ride them, I had a shop at the time and just threw them out that night... so bad I wouldn't give them away.