The TFX chassis looks like it targets the FRAY racers. Very nice looking design. I bet it handles great.
They made the brass gears smaller on the top plate in favour of a larger idler reducing the overall top plate weight itself. That's smart thinking. But no interchanging parts with Wizzard, Dash or RT HO.
The TFX is a great chassis out of the box. The 2 I have are on par with the best stock Dash, Aurora, Wizzard and AW/JL chassis. For drag racing the 15t crown got the best times on each chassis.
Recently ordered some 7.5 ohm arms and brass arm gear. Have not track tested them yet.