Well I finally got my ball bearing fans in for the stock replacements.
They work well but they are extremely loud compared to the stock sleeve fan.
They are the same type/brand as the stock fan, just ball bearing, direct replacement.
You probably bought one that is really high RPM...these fans can go up to 15k RPM. You only need about 7-10k RPM to properly cool these. Stock fans run around 9-11k.