If the bearings in the motor are perfectly fine I wouldn't replace them with ceramic looking for a performance gain but if they need to be replaced I would go with ceramics. I've got a 10.5 that's like 4 years old and the stock bearings only now are at the point of feeling less than new. At this point the rest of the motor has miles on it so personaly I will just replace the whole motor and keep it as is for a rarely used back up. $.02