Quick update (better late than never I guess... sorry for the delay):

I still don't have many track hours on these (~5) due to other issues with the car and life getting in the way. So far no reliability issues. When I installed them I didn't notice any change in the friction/rotation resistance from the old eBay hubs, so I wouldn't consider these a performance upgrade over OEM, but they seem to be working just fine.

Will update again once I get some more track time on them...