I installed the Siemens VersiCharge, plug-in (NEMA 6-50) model. I love it, but have no comparison experience. My total cost was $499 for EVSE, ~$40 for breaker, wire, outlet box, outlet. I also made a NEMA 6-50 to 14-50 adapter extension cord, to utilize RV hook-up sites when traveling in rural WV where there are no charging stations of any level. All the home EVSEs work about the same and are very reliable. I recommend to go with what looks and feels good (as long as you have a long-enough cord!)