I agree with jasonwipf; you'll probably only need to change the servo if you are racing, the stock one isn't brilliant, but it's not too bad.
the vorza is extremely tough and can take a huge amount of abuse, the weakest link i found was that the outer hinge pins on the rear are not captured properly, they use a metal bar with a screw and washer next to it to stop it sliding out, these are best replaced with proper bars that are captured with a nut on the end. the only other issue i've had was breaking a rear hub, these are about £4.00 a pair.
out of the box the rear springs are too soft, better ones are the hpi vorza red springs that are 68mm long, then you'll probably need slightly thicker oil as well, or it could be over sprung.
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