I agree on everything Colin - the only thing really that stands out is the big belt stuff. I actually broke my first belt on my original drivetrain car - I think it was from running the belts too tight.
The team drivers in Japan were actually using cars close to this but with updated prototype CVD's which aren't included.
The upper arm mount is nice to have - both me and woody bent the kit ones on the rear.
The upgrade ball studs are nicer than kit - the team drivers seem to use Yokomo or Hotbodies studs and Losi rod ends anyway.
The pistons are something and nothing - worse than kit (they rub on the bodies a lot more) and change the damping - good for different setups but not in any way an upgrade.
The alloy hubs are nice looking but I wouldn't run them and the plastic stuff is incredibly strong (never broke any).
The real upgrades would be screws and diff balls. My car uses titanium and alloy screws (not from a kit, just bought individually) and ceramic balls from Kanzen.
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