I have both the NEO Fighter and the Racing Fighter DT03s. The shell of the NEO fighter seems to fit a bit better and the wing was larger, the wing supplied with the Racing fighter was about an inch narrower.
The cars tend to be a bit heavy at the back but this gives them good traction, you might want some clear plastic tape to protect the rear screw heads.
If you've owned a DT02 it's the exact same rear end and takes the same hopups so all SandViper parts slot right in including the balldiff which I have on mine. Chuck the front tires and put on something decent for extra steering goodness, I went for Schumacher mini's on one and some cheap non name mini spikes on the other, both steer better than the stock ones Tamiya included. Rears should be fine.
Current projects: Fireblade EVO (Brushless rebuild) / Cougar SV1/2 Ebay Turd