I bought a Wallbox Pulsar Plus from the dealer I bought the Bolt from. He was selling them for $500. I have it hardwired on a 30 Amp circuit left over from an electric hot water heater. It charges 4x faster than the EVSE that came with the Bolt which is plenty for my needs.
I have noticed that charging efficiency varies wildly based on conditions.
https://www.amazon.com/Pulsar-Level-...489316520&th=1