We have a 2014 JuiceBox kit. It was rated at 60 A, but many familiar with its components felt that passing 60 A would be unsafe. Fortunately, our i3 is limited to ~30 A, so we aren't pushing its limits.
This kit offered options like a tiny LCD that displays important charging information, a wireless remote, and WiFi. I chose the LCD and wireless remote options but not the WiFi option because our apartment parking space is far out of range of our WiFi base station. I can use the wireless remote to change the maximum charging current in 1 A increments, to set weekday and weekend charge starting and ending times, and to set the current date and time.
However, the most important feature for me, a retired software engineer, is its open-source software written in the C language which I know and its programming cable that allows me to load new software versions that I have written. I have installed software that better reflects our use of our JuiceBox.
Unfortunately, these options are no longer available for EV owners who park outside of the range of their WiFi base stations, so I feel fortunate to have bought our JuiceBox when it was still available in kit form.
2014 BMW i3 Arravani Grey, Giga World, Tech + Driving Assist, Parking Assist, DC Fast Charging, JuiceBox EVSE