Feigao Bearing Upgrade?

[jhautz]

http://www.offshoreelectrics.com/MainPage.htm

Anyone tried the bearings bout 2/3 the way down the ''motors and mounts'' page right after the feigao motors? Its supposed to be an upgrade bearing for the Feigao motors. I have an older Feigao 540 motor that I feel like the bearings are starting to get rough and I d rather just repalce them cuz the ones it comes with are supposed to be cruddy anyway.

Are these a worth while upgrade for a 540C-XL? even if it running fine?

Would a bearing upgrade help increase the effiency of the motor enough to make any real difereance in the heat it generates?