top performance due plus 70cc

i've been recently considering of buying a cast iron 70cc kit. i've seen that the due plus kit is one of the most extreme kits available. does anyone know if this kit is truly good and reliable as well? i have an upgraded reinforced RMS crankshaft i think it will be able to cope with the cylinder, right?

 

stage 6 street race would be my choice of fast cast iron 70cc kit.

sorry no experience of due plus kit.