maybe the F104 guys can chime in.
I bought an F104 because it looks amazing (scale is a large part of f1 is it not??
), and was designed by Tech Racing. The battery inline down the center sounded like a great idea...
However, after building it and driving it, the execution of the chassis design is not so good. The pivot location of the screw adjustment for the rear T plate is much too close to the motor pod, making the rear end extremely stiff.
Not sure if this alone contributed to it, but the car had very odd handling characteristics. Nothign like the F103 of old...
The car would have tons of off power understeer, and on power oversteer. The transitions between the two would be relatively quick, so it was a handful to drive on less than ideal surfacing.
I've read fantastic things about the F109... people say the car is so good that the f104 cant even be compared--it's of a different class. if you want a good handling f1 car and arent limited to tamiya, f109 is cheaper and higher performing. the link rear end alone is worth it.
change up the f109 front arms to f104 items if you like the modern narrow look, and you got yourself a scale looking f1 again (with body and tires also needed, of course)