Ceramic Bearings for 1/8 nitro
 

You can use ball bearing nmb mugen or kyosho ball bearing

Ceramics also go bad when dirt is comming inside the bearing.....

It is your money but a lot of people do swear with just simple steel bearings because ceramics do not add that much value for the high price.

I'm guessing most of the possible performance gains are from weight reduction of the chassi, for those chasing every last bit.
If you want it to spin more freely just de-grease them and apply some thin oil, that does make a little difference.
But sure, I run ceramics for the diffs sometimes. Closer to the wheels they spin so slow that it makes less sens, and usually more dirt gets in there too. :)

I myself have never had an issue with dollar bearings.. Avid for the win.....

ceramic bearings are lighter, stronger and less friction = less heat. They will last longer im sure.
If you can afford them get them. :tire::tire::tire::tire:

On paper yes, in reality the gain is only noticeable if you need that 0.1 sec a lap gain to become a world champion.

And there are ceramics and ceramics... Good quality ceramics will cost a lot more than the cheap RC ones most people buy.....