Paul at EVCharge4U. My HPWC install required the addition of a new panel, which added to the cost... in total, including permits and inspection cost, it came to about $2600.
They spent a significant amount of time on the installation (HPWC outside garage wall, new panel inside garage wall) and it turned out perfectly. It's ready for use immediately, although the final inspection may be weeks later (EVCharge4U comes back to meet with the inspector). Ours has functioned with zero problems.
There's nothing special about installing the wall chargers. Any qualified electrician can do it. Get the wire size right and you're good to go. My install cost $2000 because I was quite a ways from the panel and the 100 amp breaker was a bit pricey.