The real debate has to happen on the racetrack. As long as costs don't skyrocket, I welcome the irs option. But if there is no performance benifit and the costs are greater, what's the point? So far it looks like 3racing is keeping the cost pretty comparable, aside from some saying the front suspension is fragile. Put 'em ALL together on the track (except corally) and see who's got what. And speaking of Corally, I wish that car came back with a Tamiya front suspension option