If you want my honest opinion buy the spectra edge, because it is capable of going from 2.8 to 3.6 to 4.2 you actually have more than a thunder or a spirit all one machine that can adjust its hit on the fly. It has a better motor system then the Cheyenne series and it uses RCA connections which is way better so there is no question. Buy a Spectre edge and kill two birds with one stone.