The thrust bearings are as good a quality as any others.
Some people like to use carbide / ceramic thrust bearings but to be honest they are not necessary for the thrusts.
I would recomend changing the main 3/32" diff balls thought, an improvement can be found there! I've got Kyosho ceramics in the RB5 and an other brand in the ZX5-FS.
Hope that helps
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