I purchased a RC10T4 Factory team to race in the Masters Class in our area. My only other truck is a slash that I have modified to be as competitive as possible. The RC10T4 was fantastic out of the box. I tuned the suspension to be like was stated up thread. No issues with traction or steering.
I prefer the SCT class so I am now planning to switch my T4 to a SC10. This was my plan from the start. I expect that the SC10 will be way better than the Slash due to tune-ability and weight control. It will cost me about $120 for parts and tires/wheels to convert but much cheaper than a new SC10 Kit when you consider the MIP ball diff and ti parts. I plan to drill the rear shock tower to accept the bumper/body mount and will use the new RPM front bumper/brace so I don't need a new front shock tower. Should be light!!!
The SC10 is dominant in both Stock and Open SCT in our area. We allow the 1 deg hubs on Stock class which does help rear traction.