There has been a very big effort to bring back the true spec class for new racers, with tamperproof motors and fixed fdr, so the differences in chassis designs will be minimized, although setup knowledge will be even more important.... Any of these chassis can get you a podium finish as long as you can get to minimum weight with the correct setup in the new Spec Class orientated racing scene... I got my tc4 FT ready to race Spec carpet Class, so the expensive kits are not required.... Cheers....