The basic engineering principles of the old RC10 are still very viable today and work extremely well, and the setup is the key. Racers here in Florida, are starting to see that 20+ year old cars and technology (Airtronics CS2P Radio on 27 mhz) still work perfectly and compete nearly every week side by side and normally the RC10 finishes between 1st place and 5th place in the A-Main. Remember a lot of this has to do with the driver, it isn't all car, which is why I made the statement in the first paragraph. You set the car up as best you can for your track conditions and then you need to drive it very well, in order to do well.
It doesn't matter if you race it against a B4.1 or the new TLR 22 either as we hope to see soon enough (can't wait!). If you have a state of the art buggy with the latest and best items on it, in the end you as a driver still need to go the race distance driving the car correctly and quickly.
This is why I enjoy racing the two gold tub CE's I have, one in the regular mod class with an 8.5 brushless system and the other in the stock 17.5 or vintage class 13.5 category. I feel I don't need a special vintage class to race the old RC10, and truely prefer to race it against the current cars and racers.
Remember I also bought a FT B4 but just prefer not to run it, since the laptimes and feel of the cars are so close, for me.

I have to say I am not the ONLY one here seeing this as a few other racers have actually sold their B4's and are racing the RC10 in Team Car form. One racer commented after Tqing and winning a few races after the switch that his B4 never felt this good and easy to go fast with. This he did against Kyosho RB5's, Schumacher and B4.1 buggies.
Makes you wonder, there is a lot behind how you setup and drive the car.