"Car handle also direct air toward cooling head providing high efficient cooling"
Any RC car company that states their "car handle" will direct air towards the cooling head, are stupid. I'd be weary of their claims of hitting 73 mph. I have seen in an RC magazine, a shootout between this car and a Schumacher Fusion (not sure of the schumacher model), and although the Cen car won the top speed test, they said the acceleration of this car sucks.
Stick with an NTC3, CD3, or LD3 if you want to buy an RTR. HPI cars are very reliable and can take a beating, but the handling of the RS4 3's suck. I've owned an NTC3, RS4 3 SS, RS4 3 18SS, and currently own a Mugen MTX3 prospec, and a Yokomo Gt4-R. If I were to rank my cars...
1. Mugen MTX3
2. Yokomo GT4-R
3. NTC3
4. RS4 3 18SS
5. RS4 3 SS