The racing ones which are non-lowprofile are good - the very latest ones like Stu Wood is running (team driver) are really good.
The lowprofile is pretty much as you describe, plastic gears and not very strong - but it's made for airplane use not cars.
I use a KO lowprofile servo in my tamiya 501X - I took out a cheap bluebird 617 (std size) servo which I'd been running for ages and it performed very well.
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