CO2 is a promising refrigerant for numerous applications within the cold chain. The inherent throttling losses of the transcritical cycle can be mitigated by using two-phase ejectors. However, ejectors have yet to be successfully applied to mass-produced systems. Complex ejector designs drive product cost and reduce the likelihood of their widespread use. The focus of this paper is to systematically determine the performance trade-offs of less complex ejector designs. Various simplified motive nozzle and diffuser designs were experimentally investigated. While there are differences in ejector efficiency between the different motive nozzle designs on the order of 10 percent points, the effects on system performance (capacity and COP) are far less pronounced. That is especially true when a needle mechanism is used to control the high-side pressure. Therefore, the study demonstrates that reasonable system improvements can be achieved even with less complex ejector designs, enabling a more widespread use.