GPM, Yeah Racing, Top Cad, 3Racing?

[tom_chang79]

Which one of these manufacturers produces the most quality hop-up parts for Tamiya vehicles in general?

I know that Xenon and Five Stars are Japanese so I don't have any question about their quality, but the four I listed in the title, they are from China/HK so I question their machining and material quality...

Once in a while, these companies produce decent to above average items, I just want to know which one is the best of the four.

What do you Tamiya owners think? Do any of you guys have experience with any of these four manufacturers for your vehicle?