FWIW, I did call my insurance company before I bought my JuiceBox 40 Pro as this question was raised on the leaf forum as well. I explained the situation and was told that they don't care about UL v/s. non UL. He chuckled and asked me if I knew how many things I had plugged into the outlets in my house and in this day and age of "Chinese invasion" into our homes, who knows what we are plugging in? Short answer was that in the event of a mishap due to a device malfunctioning, the insurance would still cover any and all damages.Who would like to volunteer to call their homeowner policy insurer and ask them if they'd prefer a UL listed 240v EVSE at the property they insure or a non-UL listed 240v EVSE?
JuiceBox is a solid product made in the USA by a small group of hard working folks. UL listing is expensive and maybe not worth it for them at this point.
Also, I would like to add that I have had one interaction with their service team and they were above and beyond. One of the employees actually gave me his personal cell to call him after hours while we were doing some troubleshooting of a rare situation (charging two different cars using the same EVSE).
If I ever needed a second EVSE, it would be a JuiceBox again!!